dda5b39711
regents and renumber. This patch skips files in contrib/ and crypto/ Acked by: imp Discussed with: emaste
159 lines
4.7 KiB
Groff
159 lines
4.7 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)pty.4 8.2 (Berkeley) 11/30/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 20, 2008
|
|
.Dt PTS 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pts
|
|
.Nd pseudo-terminal driver
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides support for a device-pair termed a
|
|
.Em pseudo-terminal .
|
|
A pseudo-terminal is a pair of character devices, a
|
|
.Em master
|
|
device and a
|
|
.Em slave
|
|
device.
|
|
The slave device provides to a process an interface identical
|
|
to that described in
|
|
.Xr tty 4 .
|
|
However, whereas all other devices which provide the
|
|
interface described in
|
|
.Xr tty 4
|
|
have a hardware device of some sort behind them, the slave
|
|
device has, instead, another process manipulating
|
|
it through the master half of the pseudo-terminal.
|
|
That is, anything written on the master device is
|
|
given to the slave device as input and anything written
|
|
on the slave device is presented as input on the master
|
|
device.
|
|
.Pp
|
|
The following
|
|
.Xr ioctl 2
|
|
calls apply only to pseudo-terminals:
|
|
.Bl -tag -width TIOCPTMASTER
|
|
.It Dv TIOCPKT
|
|
Enable/disable
|
|
.Em packet
|
|
mode.
|
|
Packet mode is enabled by specifying (by reference)
|
|
a nonzero parameter and disabled by specifying (by reference)
|
|
a zero parameter.
|
|
When applied to the master side of a pseudo-terminal, each subsequent
|
|
.Xr read 2
|
|
from the terminal will return data written on the slave part of
|
|
the pseudo-terminal preceded by a zero byte (symbolically
|
|
defined as
|
|
.Dv TIOCPKT_DATA ) ,
|
|
or a single byte reflecting control
|
|
status information.
|
|
In the latter case, the byte is an inclusive-or
|
|
of zero or more of the bits:
|
|
.Bl -tag -width TIOCPKT_FLUSHWRITE
|
|
.It Dv TIOCPKT_FLUSHREAD
|
|
whenever the read queue for the terminal is flushed.
|
|
.It Dv TIOCPKT_FLUSHWRITE
|
|
whenever the write queue for the terminal is flushed.
|
|
.It Dv TIOCPKT_STOP
|
|
whenever output to the terminal is stopped a la
|
|
.Ql ^S .
|
|
.It Dv TIOCPKT_START
|
|
whenever output to the terminal is restarted.
|
|
.It Dv TIOCPKT_DOSTOP
|
|
whenever
|
|
.Dv VSTOP
|
|
is
|
|
.Ql ^S
|
|
and
|
|
.Dv VSTART
|
|
is
|
|
.Ql ^Q .
|
|
.It Dv TIOCPKT_NOSTOP
|
|
whenever the start and stop characters are not
|
|
.Ql ^S/^Q .
|
|
.El
|
|
.Pp
|
|
While this mode is in use, the presence of control status information
|
|
to be read from the master side may be detected by a
|
|
.Xr select 2
|
|
for exceptional conditions.
|
|
.Pp
|
|
This mode is used by
|
|
.Xr rlogin 1
|
|
and
|
|
.Xr rlogind 8
|
|
to implement a remote-echoed, locally
|
|
.Ql ^S/^Q
|
|
flow-controlled
|
|
remote login with proper back-flushing of output; it can be
|
|
used by other similar programs.
|
|
.It Dv TIOCGPTN
|
|
Obtain device unit number, which can be used to generate the filename of
|
|
the pseudo-terminal slave device. This
|
|
.Xr ioctl 2
|
|
should not be used directly. Instead, the
|
|
.Xr ptsname 3
|
|
function should be used.
|
|
.It Dv TIOCPTMASTER
|
|
Determine whether the file descriptor is pointing to a pseudo-terminal
|
|
master device.
|
|
This
|
|
.Xr ioctl 2
|
|
should not be used directly. It is used to implement routines like
|
|
.Xr grantpt 3 .
|
|
.El
|
|
.Sh FILES
|
|
The files used by this
|
|
pseudo-terminals implementation are:
|
|
.Bl -tag -width ".Pa /dev/pts/[num]"
|
|
.It Pa /dev/pts/[num]
|
|
Pseudo-terminal slave devices.
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
None.
|
|
.Sh SEE ALSO
|
|
.Xr grantpt 3 ,
|
|
.Xr posix_openpt 2 ,
|
|
.Xr ptsname 3 ,
|
|
.Xr pty 4 ,
|
|
.Xr tty 4
|
|
.Sh HISTORY
|
|
A
|
|
pseudo-terminal driver appeared in
|
|
.Bx 4.2 .
|
|
In
|
|
.Fx 8.0 ,
|
|
it was replaced with the
|
|
.Nm
|
|
driver.
|