1.\" 2.\" Copyright (c) 1996 Joerg Wunsch 3.\" 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" " 26.Dd May 10, 2020 27.Dt LOGIN_TTY 3 28.Os 29.Sh NAME 30.Nm login_tty 31.Nd prepare a tty for a new login session 32.Sh LIBRARY 33.Lb libutil 34.Sh SYNOPSIS 35.In libutil.h 36.Ft int 37.Fn login_tty "int fd" 38.Sh DESCRIPTION 39The function 40.Fn login_tty 41prepares a terminal for a new login session. 42The file descriptor 43.Ar fd 44passed to 45.Fn login_tty 46must be opened for reading and writing on a terminal device. 47It will be 48made the controlling terminal for the calling process, after allocating 49a new session with 50.Xr setsid 2 . 51This terminal device will also be made the standard input, standard output, 52and standard error output of the calling process. 53.Sh RETURN VALUES 54The 55.Fn login_tty 56function returns -1 if it could not make the device referenced by 57.Ar fd 58the controlling terminal of the calling process, and 0 otherwise. 59.Sh SEE ALSO 60.Xr dup2 2 , 61.Xr ioctl 2 , 62.Xr setsid 2 , 63.Xr tty 4 64.Sh HISTORY 65The function 66.Fn login_tty 67first appeared in 68.Bx 4.4 . 69