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+.\" Copyright (c) 1983, 1991, 1993
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+.\"
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+.\"     From: @(#)send.2	8.2 (Berkeley) 2/21/94
+.\" $FreeBSD$
+.\"
+.Dd December 15, 2006
+.Dt SCTP_GETADDRLEN 3
+.Os
+.Sh NAME
+.Nm sctp_getaddrlen
+.Nd return the address length of an address family
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In netinet/sctp.h
+.Ft int
+.Fn sctp_getaddrlen "sa_family_t family"
+.Sh DESCRIPTION
+The
+.Fn sctp_getaddrlen
+function returns the size of a specific address family.
+This function
+is provided for application binary compatibility since it
+provides the application with the size the operating system
+thinks the specific address family is.
+Note that the function
+will actually create an SCTP socket and then gather the
+information via a
+.Fn getsockopt
+system calls.
+If for some reason a SCTP socket cannot
+be created or the
+.Fn getsockopt
+call fails, an error will be returned
+with
+.Va errno
+set as specified in the
+.Fn socket
+or
+.Fn getsockopt
+system call.
+.Sh RETURN VALUES
+The call returns the number of bytes that the operating
+system expects for the specific address family or -1.
+.Sh ERRORS
+The
+.Fn sctp_getaddrlen
+function can return the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The address family specified does NOT exist.
+.El
+.Sh SEE ALSO
+.Xr getsockopt 2 ,
+.Xr socket 2 ,
+.Xr sctp 4