228 lines
6 KiB
Groff
228 lines
6 KiB
Groff
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.\" $NetBSD: ttys.5,v 1.18 2012/04/21 12:27:28 roy Exp $
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.\"
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.\" 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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.\"
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.Dd April 5, 2012
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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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This information is read with the
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.Xr getttyent 3
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library routines.
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.Pp
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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 comprising 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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Each line in
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.Nm
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has the format:
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.Dl tty command type flags
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.Pp
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The first field is 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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.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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However, it can be any desired command, for example the start up
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for a window system terminal emulator or some other daemon process,
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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 terminfo 5
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data base file.
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The environment variable
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.Dv TERM
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is initialized with the value by 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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or specify a window system process that
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.Xr init 8
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will maintain for the terminal line
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or a key into a database of tty attributes (currently unused).
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.Pp
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.Bl -tag -width softcar
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.It Sy on No or Sy off
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.Xr init 8
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should (or should not) execute the command given in the second field.
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.It Sy secure
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If
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.Sy on
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is specified, allows users with a uid of 0
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.Pq e.g. Qq root
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to login on this line.
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.It Sy local
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Sets the
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.Dv TIOCFLAG_CLOCAL
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.Xr tty 4
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flag for the device.
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This will cause the
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.Xr termios 4
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.Dv CLOCAL
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flag to be set on every open and thus modem control signal lines will be
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ignored by default.
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.It Sy softcar
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Causes the driver to ignore hardware carrier on the line (by setting the
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.Dv TIOCFLAG_SOFTCAR
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.Xr tty 4
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flag).
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.It Sy rtscts
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Sets the
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.Dv TIOCFLAG_CRTSCTS
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.Xr tty 4
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flag for the device to enable
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.Tn RTS /
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.Tn CTS
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.Qq hardware
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flow control by default.
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.It Sy mdmbuf
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Sets the
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.Dv TIOCFLAG_MDMBUF
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.Xr tty 4
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flag for the device to enable
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.Tn DTR /
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.Tn DCD
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.Qq hardware
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flow control by default.
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.El
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.Pp
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The flags
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.Qq local ,
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.Qq rtscts ,
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.Qq mdmbuf ,
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and
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.Qq softcar
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modify the default behaviour of the terminal line, and their actions
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are device driver dependent.
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These flag fields should not be quoted.
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.Pp
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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 ``class='' may be followed by a quoted string used
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as a key into a database of attributes for that category of tty.
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See
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.Xr getttynam 3
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for more information on this feature.
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.Pp
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After changing the
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.Nm
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file a
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.Dv SIGHUP
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signal can be sent to
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.Xr init 8
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with the command
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.Dq Li "kill \-s HUP 1" .
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On receipt of this signal,
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.Xr init 8
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will re-read the
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.Nm
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file and spawn any necessary
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.Xr getty 8
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processes.
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.Pp
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.Sy Nota Bene :
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Sending
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.Dv SIGHUP
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to
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.Xr init 8
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does
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.Em not
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change the state of the various
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.Xr tty 4
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device flags listed above; the
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.Xr ttyflags 8
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program must be run for changes in those flags to take effect on the devices.
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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 # 555-1234
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# Mike's terminal: hp2621
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ttyh0 "/usr/libexec/getty std.9600" hp2621-nl on # 457 Evans
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# John's terminal: vt100
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ttyh1 "/usr/libexec/getty std.9600" vt100 on # 459 Evans
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# terminal emulate/window system
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ttyv0 "/usr/new/xterm -L :0" vs100 on window="/usr/new/Xvs100 0"
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# Network pseudo ttys -- don't enable getty
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ttyp0 none network
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ttyp1 none network off
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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 ttyslot 3 ,
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.Xr tty 4 ,
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.Xr gettytab 5 ,
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.Xr terminfo 5 ,
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.Xr getty 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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