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diff --git a/src/lib/libc/net/sockatmark.3 b/src/lib/libc/net/sockatmark.3
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-.\" Copyright (c) 2002 William C. Fenner.  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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE 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 FreeBSD: r108087 2002-12-19 01:40:28 -0800
-.\" $OpenBSD: sockatmark.3,v 1.2 2019/06/20 14:19:25 deraadt Exp $
-.\"
-.Dd $Mdocdate: June 20 2019 $
-.Dt SOCKATMARK 3
-.Os
-.Sh NAME
-.Nm sockatmark
-.Nd determine whether the read pointer is at the out-of-band data mark
-.Sh SYNOPSIS
-.In sys/socket.h
-.Ft int
-.Fn sockatmark "int s"
-.Sh DESCRIPTION
-The
-.Fn sockatmark
-function returns 1 if the read pointer for the socket
-.Fa s
-is currently at the out-of-band data mark.
-Otherwise, it returns 0 if the socket doesn't have an out-of-band
-data mark or if there is normal data to be received before the mark.
-.Sh RETURN VALUES
-Upon successful completion, the
-.Fn sockatmark
-function returns the value 1 if the read pointer is pointing at
-the out-of-band data mark, 0 if it is not.
-Otherwise the value \-1 is returned
-and the global variable
-.Va errno
-is set to
-indicate the error.
-.Sh EXAMPLES
-The routine used in the historical remote login process to flush
-output on receipt of an interrupt or quit signal is shown below.
-It reads the normal data up to the mark (to discard it),
-then reads the out-of-band byte.
-.Bd -literal -offset indent
-#include <sys/socket.h>
-\&...
-oob()
-{
-        int mark;
-        char waste[BUFSIZ];
-
-        for (;;) {
-                if ((mark = sockatmark(rem)) == -1) {
-                        perror("sockatmark");
-                        break;
-                }
-                if (mark)
-                        break;
-                (void) read(rem, waste, sizeof (waste));
-        }
-        if (recv(rem, &mark, 1, MSG_OOB) == -1) {
-                perror("recv");
-                ...
-        }
-        ...
-}
-.Ed
-.Sh ERRORS
-The
-.Fn sockatmark
-call fails if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-.Fa s
-is not a valid descriptor.
-.It Bq Er ENOTTY
-.Fa s
-is valid but does not refer to a socket.
-.El
-.Sh SEE ALSO
-.Xr recv 2 ,
-.Xr send 2
-.Sh STANDARDS
-The
-.Fn sockatmark
-function conforms to
-.St -p1003.1-2008 .
-.Sh HISTORY
-The
-.Fn sockatmark
-function was introduced by
-.St -p1003.1-2001
-to standardize the historical
-.Dv SIOCATMARK
-.Xr ioctl 2 .
-The
-.Fn sockatmark
-function appeared in
-.Ox 5.7 .
-.Pp
-The
-.Er ENOTTY
-error is returned instead of the usual
-.Er ENOTSOCK
-error to match the historical behavior of
-.Dv SIOCATMARK .