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.\"
.\" Copyright (c) 1996 Joerg Wunsch
.\"
.\" 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 DEVELOPERS ``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 DEVELOPERS 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.
.\"
.\" $Id$
.\" "
.Dd December 29, 1996
.Os
.Dt LOGIN_TTY 3
.Sh NAME
.Nm login_tty
.Nd prepare a tty for a new login session
.Sh SYNOPSIS
.Fd #include <libutil.h>
.Ft int
.Fn login_tty "int fd"
.Pp
Link with
.Va -lutil
on the
.Xr cc 1
command line.
.Sh DESCRIPTION
The function
.Fn login_tty
prepares a terminal for a new login session. The file descriptor
.Ar fd
passed to
.Fn login_tty
must be opened for reading and writing on a terminal device. It will be
made the controlling terminal for the calling process, after allocating
a new session with
.Xr setsid 2 .
This terminal device will also be made the standard input, standard output,
and standard error output of the calling process.
.Sh RETURN VALUES
.Fn Login_tty
returns -1 if it could not make the device referenced by
.Ar fd
the controlling terminal of the calling process, and 0 otherwise.
.Sh SEE ALSO
.Xr dup2 2 ,
.Xr ioctl 2 ,
.Xr setsid 2 ,
.Xr tty 4
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