2013-12-06 12:04:52 +01:00
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.\" $NetBSD: ttymsg.3,v 1.13 2013/01/16 06:44:27 wiz Exp $
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2011-09-26 18:19:29 +02:00
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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2013-12-06 12:04:52 +01:00
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.Dd January 15, 2013
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2011-09-26 18:19:29 +02:00
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.Dt TTYMSG 3
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.Os
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.Sh NAME
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.Nm ttymsg
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.Nd ttymsg utility function
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In util.h
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.Ft char *
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.Fn ttymsg "struct iovec *iov" "int iovlen" "const char *tty" "int tmout"
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.Sh DESCRIPTION
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The
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.Fn ttymsg
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function is used by
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programs such as
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.Xr talkd 8 ,
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.Xr syslogd 8 ,
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.Xr wall 1 ,
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etc., to display the contents of a uio structure on a terminal.
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.Fn ttymsg
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forks and finishes in the child if the write would block after
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waiting up to
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.Fa tmout
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seconds.
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.Sh RETURN VALUES
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.Fn ttymsg
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returns a pointer to an error string on unexpected
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error; the string is not newline-terminated.
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Various "normal" errors are
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ignored (exclusive-use, lack of permission, etc.).
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.Sh SEE ALSO
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.Xr writev 2
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2013-12-06 12:04:52 +01:00
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.Sh BUGS
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.Nm
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could grow some flags and a username/uid who is the expected owner
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of the tty.
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If the flags say so then the owner should be checked against the tty
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owner, and the message should not be sent if there is a mismatch.
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Also another flag could say check against group writable, and don't
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send a message.
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