178 lines
4.5 KiB
Groff
178 lines
4.5 KiB
Groff
.\" $NetBSD: getty.8,v 1.17 2003/08/07 09:46:42 agc Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)getty.8 8.1 (Berkeley) 6/4/93
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.\"
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.Dd December 12, 1998
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.Dt GETTY 8
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.Os
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.Sh NAME
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.Nm getty ,
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.Nm uugetty
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.Nd set terminal modes for system access
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.Sh SYNOPSIS
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.Nm
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.Oo
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.Ar type
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.Op Ar tty
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.Oc
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.Nm uugetty
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.Oo
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.Ar type
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.Op Ar tty
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.Oc
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.Sh DESCRIPTION
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The
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.Nm
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program
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is called by
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.Xr init 8
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to open and initialize the tty line, read a login name, and invoke
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.Xr login 1 .
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The devices on which to run
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.Nm
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are normally determined by
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.Xr ttys 5 .
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.Pp
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The
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.Nm
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program can also recognize a Point to Point Protocol
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.Pq Tn PPP
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negotiation, and, if the
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.Sy pp
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attribute in
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.Xr gettytab 5
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is set, invoke the program given by that string, e.g.,
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.Xr pppd 8 ,
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instead of
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.Xr login 1 .
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This makes it possible to use a single serial port for either a
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.Qq shell
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account with command line interface, or a
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.Tn PPP
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network link.
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.Pp
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The argument
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.Ar tty
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is the special device file in
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.Pa /dev
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to open for the terminal
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.Po
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for example,
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.Qq ttyh0
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.Pc .
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If there is no argument or the argument is
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.Ql Fl ,
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the tty line is assumed to be open as file descriptor 0.
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.Pp
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The
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.Ar type
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argument can be used to make
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.Nm
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treat the terminal line specially.
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This argument is used as an index into the
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.Xr gettytab 5
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database, to determine the characteristics of the line.
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If there is no argument, or there is no such table, the
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.Em default
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table is used.
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If there is no
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.Pa /etc/gettytab
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a set of system defaults is used.
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If indicated by the table located,
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.Nm
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will clear the terminal screen,
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print a banner heading,
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and prompt for a login name.
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Usually either the banner or the login prompt will include
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the system hostname.
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.Pp
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.Nm
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uses the
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.Xr ttyaction 3
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facility with an action of
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.Qq getty
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and user
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.Qq root
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to execute site-specific commands when it starts.
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.Pp
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Most of the default actions of
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.Nm
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can be circumvented, or modified, by a suitable
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.Xr gettytab 5
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table.
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.Pp
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The
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.Nm
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program can be set to timeout after some interval,
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which will cause dial up lines to hang up
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if the login name is not entered reasonably quickly.
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.Pp
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The
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.Nm uugetty
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program is the same, except that it uses
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.Xr pidlock 3
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to respect the locks in
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.Pa /var/spool/lock
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of processes that dial out on that tty.
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.Sh FILES
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.Bl -tag -width /var/spool/lock/LCK..ttyXX -compact
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.It Pa /etc/gettytab
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.It Pa /etc/ttys
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.It Pa /var/spool/lock/LCK..ttyXX
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "ttyxx: No such device or address."
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.It "ttyxx: No such file or address."
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A terminal which is turned on in the
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.Xr ttys 5
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file cannot be opened, likely because the requisite
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lines are either not configured into the system, the associated device
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was not attached during boot-time system configuration,
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or the special file in
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.Pa /dev
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does not exist.
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.El
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr ioctl 2 ,
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.Xr pidlock 3 ,
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.Xr ttyaction 3 ,
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.Xr tty 4 ,
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.Xr gettytab 5 ,
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.Xr ttys 5 ,
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.Xr init 8 ,
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.Xr pppd 8
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.Sh HISTORY
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A
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.Nm
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program appeared in
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.At v6 .
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