7a467312ef
of terminal devices using "pstat -t". MFC after: 2 weeks Sponsored by: The FreeBSD Foundation
126 lines
3.5 KiB
Groff
126 lines
3.5 KiB
Groff
.\" 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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.\" $FreeBSD$
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.\" "
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.Dd March 2, 2018
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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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.Nd set terminal mode
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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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.Sh DESCRIPTION
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The
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.Nm
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utility 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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.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 (for example, ``ttyh0'').
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If there is no argument or the argument is
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.Sq 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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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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.Pa gettytab
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table.
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.Pp
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The
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.Nm
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utility 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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.Sh FILES
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.Bl -tag -width /etc/gettytab -compact
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.It Pa /etc/gettytab
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.It Pa /etc/ttys
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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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.Pp
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A terminal which is turned
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on in the
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.Pa ttys
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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 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 pstat 8
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v6 .
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