Translate the TIOCSBRK & TIOCCBRK ioctl(2)s issued on a pty(4) slave to

corresponding user mode ioctls.

If the master part of the pseudo terminal previously enabled TIOCUCNTL,
it will now receive the TIOCUCNTL_{S,C}BRK commands.  This allows to
send BREAKS commands over a pty(4) independently of the serial terminal
emulator used.

Guidance and ok nicm@, ok ccardenas@, looks ok to deraadt@

1 files changed, 14 insertions, 2 deletions

diff --git a/share/man/man4/pty.4 b/share/man/man4/pty.4
index 737b9cbf36c..ca8e9d8c851 100644
--- a/share/man/man4/pty.4
+++ b/share/man/man4/pty.4
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: pty.4,v 1.23 2016/06/30 15:59:30 tedu Exp $
+.\"	$OpenBSD: pty.4,v 1.24 2018/01/08 11:52:14 mpi Exp $
 .\"	$NetBSD: pty.4,v 1.4 1998/03/21 03:14:30 fair Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)pty.4	8.2 (Berkeley) 11/30/93
 .\"
-.Dd $Mdocdate: June 30 2016 $
+.Dd $Mdocdate: January 8 2018 $
 .Dt PTY 4
 .Os
 .Sh NAME
@@ -204,6 +204,18 @@ The
 .Dv UIOCCMD Ns (0)
 is a no-op that may be used to probe for
 the existence of this facility.
+.Pp
+While this mode is in use, any of the
+.Dv TIOCSBRK
+and
+.Dv TIOCCBRK
+ioctl requests issued on the slave part of the pseudo terminal will be
+translated to a
+.Dv TIOCUCNTL_SBRK
+or
+.Dv TIOCUCNTL_CBRK
+user command on the master side.
+.Pp
 As with
 .Dv TIOCPKT
 mode, command operations may be detected with a