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+.\" $NetBSD: ttymsg.3,v 1.13 2013/01/16 06:44:27 wiz Exp $
+.\"
+.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd January 15, 2013
+.Dt TTYMSG 3
+.Os
+.Sh NAME
+.Nm ttymsg
+.Nd ttymsg utility function
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In util.h
+.Ft char *
+.Fn ttymsg "struct iovec *iov" "int iovlen" "const char *tty" "int tmout"
+.Sh DESCRIPTION
+The
+.Fn ttymsg
+function is used by
+programs such as
+.Xr talkd 8 ,
+.Xr syslogd 8 ,
+.Xr wall 1 ,
+etc., to display the contents of a uio structure on a terminal.
+.Fn ttymsg
+forks and finishes in the child if the write would block after
+waiting up to
+.Fa tmout
+seconds.
+.Sh RETURN VALUES
+.Fn ttymsg
+returns a pointer to an error string on unexpected
+error; the string is not newline-terminated.
+Various "normal" errors are
+ignored (exclusive-use, lack of permission, etc.).
+.Sh SEE ALSO
+.Xr writev 2
+.Sh BUGS
+.Nm
+could grow some flags and a username/uid who is the expected owner
+of the tty.
+If the flags say so then the owner should be checked against the tty
+owner, and the message should not be sent if there is a mismatch.
+Also another flag could say check against group writable, and don't
+send a message.