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'\" te
.\" Copyright 1989 AT&T
.\" Copyright (C) 1999, Sun Microsystems, Inc. All Rights Reserved
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
.\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.\" Copyright 2022 Oxide Computer Company
.Dd February 5, 2022
.Dt PTEM 4M
.Os
.Sh NAME
.Nm ptem
.Nd STREAMS Pseudo-Terminal Emulation module
.Sh SYNOPSIS
.In unistd.h
.In stropts.h
.Ft int
.Fo ioctl
.Fa "int fildes" ,
.Dv I_PUSH ,
.Qq ptem
.Fc
.Sh DESCRIPTION
.Nm ptem
is a STREAMS module that emulates a terminal device when used in conjunction
with the line discipline,
.Xr ldterm 4M ,
and the pseudo terminal driver,
.Xr ptm 4D .
.Pp
The
.Nm ptem
module must be pushed
.Po
see
.Dv I_PUSH
in
.Xr streamio 4I
.Pc
onto the subsidiary device of a pseudo-terminal STREAM, before the
.Xr ldterm 4M
module is pushed.
.Ss Write-side Behaviour
The
.Dv TCSETA ,
.Dv TCSETAF ,
.Dv TCSETAW ,
.Dv TCGETA ,
.Dv TCSETS ,
.Dv TCSETSW ,
.Dv TCSETSF ,
.Dv TCGETS ,
.Dv TCSBRK ,
.Dv JWINSIZE ,
.Dv TIOCGWINSZ ,
and
.Dv TIOCSWINSZ
.Xr termio 4I
.Xr ioctl 2
messages are processed and acknowledged.
.Pp
If
.Em remote mode
is not in effect,
.Nm ptem
handles the
.Dv TIOCSTI
ioctl by copying the argument bytes into an
.Dv M_DATA
message and passing it back up the read side.
Regardless of the
.Em remote mode
setting,
.Nm ptem
acknowledges the ioctl and passes a copy of it downstream for possible further
processing.
.Pp
A hang up
.Po
e.g.,
.Ic stty 0
.Pc
is converted to a zero length
.Dv M_DATA
message and passed downstream.
.Xr termio 4I
.Sy cflags
and window row and column information are stored locally, one per stream.
.Dv M_DELAY
messages are discarded.
.Pp
All other messages are passed downstream unmodified.
.Ss Read-side Behaviour
All messages are passed upstream unmodified with the following exceptions:
.Bl -bullet
.It
All
.Dv M_READ
and
.Dv M_DELAY
messages are freed in both directions.
.It
A
.Dv TCSBRK
ioctl is converted to an
.Dv M_BREAK
message and passed upstream and an acknowledgement is returned downstream.
.It
A
.Dv TIOCSIGNAL
ioctl is converted into an
.Dv M_PCSIG
message, passed upstream, and an acknowledgement is returned downstream.
.It
A
.Dv TIOCREMOTE
ioctl is converted into an
.Dv M_CTL
message, acknowledged, and passed upstream; the resulting mode is retained for
use in subsequent
.Dv TIOCSTI
parsing.
.El
.Sh SEE ALSO
.Xr stty 1 ,
.Xr ioctl 2 ,
.Xr streamio 4I ,
.Xr termio 4I ,
.Xr ldterm 4M ,
.Xr pckt 4M
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