diff options
Diffstat (limited to 'share/man/man4/pty.4')
-rw-r--r-- | share/man/man4/pty.4 | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/share/man/man4/pty.4 b/share/man/man4/pty.4 new file mode 100644 index 000000000000..515f912363b4 --- /dev/null +++ b/share/man/man4/pty.4 @@ -0,0 +1,89 @@ +.\" Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org> +.\" All rights reserved. +.\" +.\" Portions of this software were developed under sponsorship from Snow +.\" B.V., the Netherlands. +.\" +.\" 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. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. +.\" +.\" $FreeBSD$ +.\" +.Dd August 20, 2008 +.Dt PTY 4 +.Os +.Sh NAME +.Nm pty +.Nd BSD-style compatibility pseudo-terminal driver +.Sh SYNOPSIS +.Cd "device pty" +.Sh DESCRIPTION +The +.Nm +driver provides support for the traditional BSD naming scheme that was +used for accessing pseudo-terminals. +When the device +.Pa /dev/ptyXX +is being opened, a new terminal shall be created with the +.Xr pts 4 +driver. +A device node for this terminal shall be created, which has the name +.Pa /dev/ttyXX . +.Pp +New code should not try to allocate pseudo-terminals using this +interface. +It is only provided for compatibility with older C libraries +that tried to open such devices when +.Xr posix_openpt 2 +was being called. +.Sh FILES +The BSD-style compatibility pseudo-terminal driver uses the following +device names: +.Pp +.Bl -tag -width ".Pa /dev/pty[l-sL-S][0-9a-v]" +.It Pa /dev/pty[l-sL-S][0-9a-v] +Pseudo-terminal master devices. +.It Pa /dev/tty[l-sL-S][0-9a-v] +Pseudo-terminal slave devices. +.El +.Sh DIAGNOSTICS +None. +.Sh SEE ALSO +.Xr posix_openpt 2 , +.Xr pts 4 , +.Xr tty 4 +.Sh HISTORY +A +pseudo-terminal driver appeared in +.Bx 4.2 . +.Sh BUGS +Unlike previous implementations, the master slave device nodes are +destroyed when the PTY becomes unused. +A call to +.Xr stat 2 +on a nonexistent master device will already cause a new master device +node to be created. +The master device can only be destroyed by opening and closing it. +.Pp +The +.Nm +driver cannot be unloaded, because it cannot determine if it is being +used. |