37b5835028
Implement a new init(8) option in /etc/ttys. If this option is present on the entry in /etc/ttys, the entry will be active if and only if it exists. If the name starts with a '/', it will be considered an absolute path. If not, it will be a path relative to /dev. This allows one to turn off video console getty that aren't present (while running a getty on them even when they aren't the system console). Likewise with serial ports. It differs from onifconsole in only requiring the device exist rather than it be listed as one of the system consoles. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D10037
177 lines
6.1 KiB
Groff
177 lines
6.1 KiB
Groff
.\" Copyright (c) 1985, 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: @(#)ttys.5 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\" "
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.Dd March 16, 2017
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.Dt TTYS 5
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.Os
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.Sh NAME
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.Nm ttys
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.Nd terminal initialization information
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.Sh DESCRIPTION
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The file
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.Nm
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contains information that is used by various routines to initialize
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and control the use of terminal special files.
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Pseudo-terminals (see
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.Xr pts 4 )
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are not listed.
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This information is read with the
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.Xr getttyent 3
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library routines.
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There is one line in the
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.Nm
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file per special device file.
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Fields are separated by tabs and/or spaces.
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Fields comprised of more than one word should be enclosed in double
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quotes (``"'').
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Blank lines and comments may appear anywhere in the file; comments
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are delimited by hash marks (``#'') and new lines.
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Any unspecified fields will default to null.
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.Pp
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The first field is normally the
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name of the terminal special file as it is found in
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.Pa /dev .
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However, it can be any arbitrary string
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when the associated command is not related to a tty.
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.Pp
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The second field of the file is the command to execute for the line,
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usually
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.Xr getty 8 ,
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which initializes and opens the line, setting the speed, waiting for
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a user name and executing the
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.Xr login 1
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program.
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It can be, however, any desired command, for example
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the start up for a window system terminal emulator or some other
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daemon process, and can contain multiple words if quoted.
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.Pp
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The third field is the type of terminal usually connected to that
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tty line, normally the one found in the
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.Xr termcap 5
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data base file.
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The environment variable
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.Ev TERM
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is initialized with the value by
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either
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.Xr getty 8
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or
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.Xr login 1 .
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.Pp
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The remaining fields set flags in the
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.Fa ty_status
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entry (see
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.Xr getttyent 3 ) ,
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specify a window system process that
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.Xr init 8
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will maintain for the terminal line, optionally determine the
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type of tty (whether dialin, network or otherwise),
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or specify a tty group
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name that allows the login class database (see
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.Xr login.conf 5 )
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to refer to many ttys as a group, to selectively allow or
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deny access or enable or disable accounting facilities for
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ttys as a group.
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.Pp
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As flag values, the strings ``on'' and ``off'' specify that
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.Xr init 8
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should (should not) execute the command given in the second field.
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``onifconsole'' will cause this line to be enabled if and only if it is
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an active kernel console device (it is equivalent to ``on'' in this
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case).
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The flag ``onifexists'' will cause this line to be enabled if and only
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if the name exists.
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If the name starts with a ``/'', it will be considered an absolute
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path.
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Otherwise, it is considered a path relative to
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.Pa /dev .
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The flag ``secure'' (if the console is enabled) allows users with a
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uid of 0 to login on
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this line.
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The flag ``dialin'' indicates that a tty entry describes a dialin
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line, and ``network'' is obsolete and does nothing.
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Either of these strings may also be specified in the terminal type
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field.
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The string ``window='' may be followed by a quoted command
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string which
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.Xr init 8
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will execute
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.Em before
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starting the command specified by the second field.
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.Pp
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The string ``group='' may be followed by a group name comprised of
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alphanumeric characters that can be used by
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.Xr login.conf 5
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to refer to many tty lines as a group to enable or disable access
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and accounting facilities.
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If no group is specified, then the tty becomes a member of the group
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"none".
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For backwards compatibility, the ``group='' should appear last on the
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line, immediately before the optional comment.
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.Pp
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Both the second field and any command specified with ``window=''
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will be split into words and executed using
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.Xr execve 2 .
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Words are separated by any combinations of tabs and spaces.
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Arguments containing whitespace should be enclosed in single quotes
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.Pq Li ' .
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Note that no shell-style globbing or other variable substitution occurs.
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.Sh FILES
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.Bl -tag -width /etc/ttys -compact
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.It Pa /etc/ttys
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.El
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.Sh EXAMPLES
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.Bd -literal
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# root login on console at 1200 baud
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console "/usr/libexec/getty std.1200" vt100 on secure
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# dialup at 1200 baud, no root logins
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ttyd0 "/usr/libexec/getty d1200" dialup on group=dialup # 555-1234
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# Mike's terminal: hp2621
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ttyh0 "/usr/libexec/getty std.9600" hp2621-nl on group=dialup # 457 Evans
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# John's terminal: vt100
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ttyh1 "/usr/libexec/getty std.9600" vt100 on group=dialup # 459 Evans
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# terminal emulate/window system
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ttyv0 "/usr/local/bin/xterm -display :0" xterm on window="/usr/local/bin/X :0"
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.Ed
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.Sh SEE ALSO
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.Xr login 1 ,
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.Xr getttyent 3 ,
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.Xr gettytab 5 ,
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.Xr login.conf 5 ,
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.Xr termcap 5 ,
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.Xr getty 8 ,
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.Xr init 8
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.\".Xr init 8 ,
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.\".Xr ttyflags 8
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.Sh HISTORY
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A
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.Nm
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file appeared in
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.At v6 .
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