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+.\"  Copyright (c) 2017, Joyent, Inc.
+.\"  Copyright 1989 AT&T  Copyright (c) 1996, Sun Microsystems, Inc.  All Rights Reserved
+.\" The contents of this file are subject to the terms of the
+.\" Common Development and Distribution License (the "License").
+.\" You may not use this file except in compliance with the License.
+.\"
+.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+.\" or http://www.opensolaris.org/os/licensing.
+.\" See the License for the specific language governing permissions
+.\" and limitations under the License.
+.\"
+.\" When distributing Covered Code, include this CDDL HEADER in each
+.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+.\" If applicable, add the following below this CDDL HEADER, with the
+.\" fields enclosed by brackets "[]" replaced with your own identifying
+.\" information: Portions Copyright [yyyy] [name of copyright owner]
+.Dd October 29, 2017
+.Dt SOCKIO 4I
+.Os
+.Sh NAME
+.Nm sockio
+.Nd ioctls that operate directly on sockets
+.Sh SYNOPSIS
+.In sys/sockio.h
+.Sh DESCRIPTION
+The
+.Sy ioctl Ns s
+listed in this manual page apply directly to sockets,
+independent of any underlying protocol.
+The
+.Xr setsockopt 3SOCKET
+call
+.Po
+see
+.Xr getsockopt 3SOCKET
+.Pc
+is the primary method for operating on sockets,
+rather than on the underlying protocol or network interface.
+.Sy ioctl Ns s
+for a specific network interface or protocol are documented in the manual page
+for that interface or protocol.
+.Bl -tag -width SIOCCATMARK
+.It Dv SIOCSPGRP
+The argument is a pointer to an
+.Vt int .
+Set the process-group
+.Sy ID
+that will subsequently receive
+.Dv SIGIO
+or
+.Dv SIGURG
+signals for the socket
+referred to by the descriptor passed to
+.Sy ioctl
+to the value of that
+.Vt int .
+The argument must be either positive (in which case it must be a
+process
+.Sy ID )
+or negative (in which case it must be a process group).
+.It Dv SIOCGPGRP
+The argument is a pointer to an
+.Vt int .
+Get the value of that
+.Vt int
+to the process-group
+.Sy ID
+that is receiving
+.Dv SIGIO
+or
+.Dv SIGURG
+signals for the socket referred to by the descriptor passed to
+.Sy ioctl .
+.It Dv SIOCCATMARK
+The argument is a pointer to an
+.Vt int .
+Set the value of that
+.Vt int
+to
+.Sy 1
+if the read pointer for the socket referred to by the descriptor passed
+to
+.Xr ioctl 2
+points to a mark in the data stream for an out-of-band message.
+Set the value of that
+.Vt int
+to
+.Sy 0
+if the read pointer for the socket
+referred to by the descriptor passed to
+.Sy ioctl
+does not point to a mark
+in the data stream for an out-of-band message.
+.El
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr getsockopt 3SOCKET