1.\" $OpenBSD: getty.8,v 1.15 2014/11/15 14:41:03 bentley Exp $ 2.\" Copyright (c) 1980, 1991, 1993 3.\" The Regents of the University of California. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of the University nor the names of its contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" from: @(#)getty.8 8.1 (Berkeley) 6/4/93 30.\" 31.Dd $Mdocdate: November 15 2014 $ 32.Dt GETTY 8 33.Os 34.Sh NAME 35.Nm getty 36.Nd set terminal mode 37.Sh SYNOPSIS 38.Nm getty 39.Oo 40.Ar type 41.Op Ar tty 42.Oc 43.Sh DESCRIPTION 44The 45.Nm 46program 47is called by 48.Xr init 8 49to open and initialize the tty line, read a login name, and invoke 50.Xr login 1 . 51.Pp 52The argument 53.Ar tty 54is the special device file in 55.Pa /dev 56to open for the terminal (for example, 57.Pa ttyh0 ) . 58If there is no argument or the argument is 59.Sq - , 60the tty line is assumed to be open as file descriptor 0. 61.Pp 62The 63.Ar type 64argument can be used to make 65.Nm 66treat the terminal line specially. 67This argument is used as an index into the 68.Xr gettytab 5 69database, to determine the characteristics of the line. 70If there is no argument, or there is no such table, the 71.Em default 72table is used. 73If there is no 74.Pa /etc/gettytab 75a set of system defaults is used. 76If indicated by the table located, 77.Nm 78will clear the terminal screen, 79print a banner heading, 80and prompt for a login name. 81Usually either the banner or the login prompt will include 82the system hostname. 83.Pp 84Most of the default actions of 85.Nm 86can be circumvented, or modified, by a suitable 87.Xr gettytab 5 88table. 89.Pp 90The 91.Nm 92program 93can be set to timeout after some interval, 94which will cause dial up lines to hang up 95if the login name is not entered reasonably quickly. 96.Sh RESOURCES 97.Nm 98is started by 99.Xr init 8 , 100with a process priority, umask, and resource limits based on the 101.Dq default 102entry in 103.Pa /etc/login.conf . 104.Sh FILES 105.Bl -tag -width /etc/gettytab -compact 106.It Pa /etc/gettytab 107.El 108.Sh DIAGNOSTICS 109.Bl -diag 110.It "ttyxx: No such device or address." 111.It "ttyxx: No such file or address." 112A terminal which is turned 113on in the 114.Xr ttys 5 115file cannot be opened, likely because the requisite 116lines are either not configured into the system, the associated device 117was not attached during boot-time system configuration, 118or the special file in 119.Pa /dev 120does not exist. 121.El 122.Sh SEE ALSO 123.Xr login 1 , 124.Xr ioctl 2 , 125.Xr tty 4 , 126.Xr gettytab 5 , 127.Xr login.conf 5 , 128.Xr ttys 5 , 129.Xr init 8 130.Sh HISTORY 131A 132.Nm 133program appeared in 134.At v6 . 135