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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.
+.\" "
+.Dd May 10, 2020
+.Dt LOGIN_TTY 3
+.Os
+.Sh NAME
+.Nm login_tty
+.Nd prepare a tty for a new login session
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In libutil.h
+.Ft int
+.Fn login_tty "int fd"
+.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
+The
+.Fn login_tty
+function 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
+.Sh HISTORY
+The function
+.Fn login_tty
+first appeared in
+.Bx 4.4 .