freebsd-dev/lib/libutil/login_tty.3
Gordon Bergling 816ca3d10f libutil: Fix mandoc warnings
- missing comma before name
- possible typo in section name: Sh CAVEAT instead of CAVEATS
- useless macro: Tn
- blank line in fill mode, using .sp
- no blank before trailing delimiter: Dv NULL?

MFC after:	3 days
2022-08-07 16:30:24 +02:00

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.\"
.\" Copyright (c) 1996 Joerg Wunsch
.\"
.\" All rights reserved.
.\"
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.\" 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
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.\" documentation and/or other materials provided with the distribution.
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.\" 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.
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" $FreeBSD$
.\" "
.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 .