Module Name:    src
Committed By:   kre
Date:           Wed Oct 25 06:32:59 UTC 2017

Modified Files:
        src/bin/stty: stty.1
        src/distrib/sets/lists/base: shl.mi
        src/distrib/sets/lists/comp: mi
        src/distrib/sets/lists/debug: shl.mi
        src/lib/libc: shlib_version
        src/lib/libc/termios: Makefile.inc
        src/sys/sys: termios.h ttycom.h
Added Files:
        src/lib/libc/termios: tcgetwinsize.3 tcgetwinsize.c tcsetwinsize.c

Log Message:
Implement tcgetwinsize() and tcsetwinsize() in libc, with access
via <termios.h> (and document them.)   Bump libc minor number for them.

Arrange for "struct winsize" to become visible in <termios.h>

Fix stty(1) so that "cols" is reported as the arg to set number of columns,
and "columns" is the alias, rather than the other way around, as "cols" is
what has been added to POSIX.

This is to conform with updates to be included in 1003.1 issue 8
(whenever that gets published) currently available at:
  http://austingroupbugs.net/view.php?id=1053   (see note 3863)
  http://austingroupbugs.net/view.php?id=1151   (see note 3856)


To generate a diff of this commit:
cvs rdiff -u -r1.43 -r1.44 src/bin/stty/stty.1
cvs rdiff -u -r1.823 -r1.824 src/distrib/sets/lists/base/shl.mi
cvs rdiff -u -r1.2152 -r1.2153 src/distrib/sets/lists/comp/mi
cvs rdiff -u -r1.185 -r1.186 src/distrib/sets/lists/debug/shl.mi
cvs rdiff -u -r1.277 -r1.278 src/lib/libc/shlib_version
cvs rdiff -u -r1.4 -r1.5 src/lib/libc/termios/Makefile.inc
cvs rdiff -u -r0 -r1.1 src/lib/libc/termios/tcgetwinsize.3 \
    src/lib/libc/termios/tcgetwinsize.c src/lib/libc/termios/tcsetwinsize.c
cvs rdiff -u -r1.33 -r1.34 src/sys/sys/termios.h
cvs rdiff -u -r1.20 -r1.21 src/sys/sys/ttycom.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

Modified files:

Index: src/bin/stty/stty.1
diff -u src/bin/stty/stty.1:1.43 src/bin/stty/stty.1:1.44
--- src/bin/stty/stty.1:1.43	Sun Aug 14 23:29:43 2016
+++ src/bin/stty/stty.1	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-.\"	$NetBSD: stty.1,v 1.43 2016/08/14 23:29:43 sevan Exp $
+.\"	$NetBSD: stty.1,v 1.44 2017/10/25 06:32:59 kre Exp $
 .\"
 .\" Copyright (c) 1990, 1993, 1994
 .\"	The Regents of the University of California.  All rights reserved.
@@ -477,13 +477,13 @@ The status line consists of the
 system load average, the current command name, its process ID, the
 event the process is waiting on (or the status of the process), the user
 and system times, percent CPU, and current memory usage.
-.It Cm columns Ar number
+.It Cm cols Ar number
 The terminal size is recorded as having
 .Ar number
 columns.
-.It Cm cols Ar number
+.It Cm columns Ar number
 An alias for
-.Cm columns .
+.Cm cols .
 .It Cm rows Ar number
 The terminal size is recorded as having
 .Ar number

Index: src/distrib/sets/lists/base/shl.mi
diff -u src/distrib/sets/lists/base/shl.mi:1.823 src/distrib/sets/lists/base/shl.mi:1.824
--- src/distrib/sets/lists/base/shl.mi:1.823	Tue Oct 10 19:31:56 2017
+++ src/distrib/sets/lists/base/shl.mi	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-# $NetBSD: shl.mi,v 1.823 2017/10/10 19:31:56 christos Exp $
+# $NetBSD: shl.mi,v 1.824 2017/10/25 06:32:59 kre Exp $
 #
 # Note:	Don't delete entries from here - mark them as "obsolete" instead,
 #	unless otherwise stated below.
@@ -18,7 +18,7 @@
 ./lib/libblacklist.so.0.0			base-sys-shlib		dynamicroot
 ./lib/libc.so					base-sys-shlib		dynamicroot
 ./lib/libc.so.12				base-sys-shlib		dynamicroot
-./lib/libc.so.12.208				base-sys-shlib		dynamicroot
+./lib/libc.so.12.209				base-sys-shlib		dynamicroot
 ./lib/libcrypt.so				base-sys-shlib		dynamicroot
 ./lib/libcrypt.so.1				base-sys-shlib		dynamicroot
 ./lib/libcrypt.so.1.0				base-sys-shlib		dynamicroot
@@ -217,7 +217,7 @@
 ./usr/lib/libc++.so.1.0				base-sys-shlib		compatfile,libcxx
 ./usr/lib/libc.so				base-sys-shlib		compatfile
 ./usr/lib/libc.so.12				base-sys-shlib		compatfile
-./usr/lib/libc.so.12.208			base-sys-shlib		compatfile
+./usr/lib/libc.so.12.209			base-sys-shlib		compatfile
 ./usr/lib/libcdk.so				base-obsolete		compatfile,obsolete
 ./usr/lib/libcom_err.so				base-krb5-shlib		compatfile,kerberos
 ./usr/lib/libcom_err.so.8			base-krb5-shlib		compatfile,kerberos

Index: src/distrib/sets/lists/comp/mi
diff -u src/distrib/sets/lists/comp/mi:1.2152 src/distrib/sets/lists/comp/mi:1.2153
--- src/distrib/sets/lists/comp/mi:1.2152	Mon Oct 16 11:38:25 2017
+++ src/distrib/sets/lists/comp/mi	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-#	$NetBSD: mi,v 1.2152 2017/10/16 11:38:25 maya Exp $
+#	$NetBSD: mi,v 1.2153 2017/10/25 06:32:59 kre Exp $
 #
 # Note: don't delete entries from here - mark them as "obsolete" instead.
 ./etc/mtree/set.comp				comp-sys-root
@@ -9570,9 +9570,11 @@
 ./usr/share/man/cat3/tcgetattr.0		comp-c-catman		.cat
 ./usr/share/man/cat3/tcgetpgrp.0		comp-c-catman		.cat
 ./usr/share/man/cat3/tcgetsid.0			comp-c-catman		.cat
+./usr/share/man/cat3/tcgetwinsize.0		comp-c-catman		.cat
 ./usr/share/man/cat3/tcsendbreak.0		comp-c-catman		.cat
 ./usr/share/man/cat3/tcsetattr.0		comp-c-catman		.cat
 ./usr/share/man/cat3/tcsetpgrp.0		comp-c-catman		.cat
+./usr/share/man/cat3/tcsetwinsize.0		comp-c-catman		.cat
 ./usr/share/man/cat3/td_close.0			comp-obsolete		obsolete
 ./usr/share/man/cat3/td_map_pth2thr.0		comp-obsolete		obsolete
 ./usr/share/man/cat3/td_open.0			comp-obsolete		obsolete
@@ -17081,9 +17083,11 @@
 ./usr/share/man/html3/tcgetattr.html		comp-c-htmlman		html
 ./usr/share/man/html3/tcgetpgrp.html		comp-c-htmlman		html
 ./usr/share/man/html3/tcgetsid.html		comp-c-htmlman		html
+./usr/share/man/html3/tcgetwinsize.html		comp-c-htmlman		html
 ./usr/share/man/html3/tcsendbreak.html		comp-c-htmlman		html
 ./usr/share/man/html3/tcsetattr.html		comp-c-htmlman		html
 ./usr/share/man/html3/tcsetpgrp.html		comp-c-htmlman		html
+./usr/share/man/html3/tcsetwinsize.html		comp-c-htmlman		html
 ./usr/share/man/html3/td_close.html		comp-obsolete		obsolete
 ./usr/share/man/html3/td_map_pth2thr.html	comp-obsolete		obsolete
 ./usr/share/man/html3/td_open.html		comp-obsolete		obsolete
@@ -24653,9 +24657,11 @@
 ./usr/share/man/man3/tcgetattr.3		comp-c-man		.man
 ./usr/share/man/man3/tcgetpgrp.3		comp-c-man		.man
 ./usr/share/man/man3/tcgetsid.3			comp-c-man		.man
+./usr/share/man/man3/tcgetwinsize.3		comp-c-man		.man
 ./usr/share/man/man3/tcsendbreak.3		comp-c-man		.man
 ./usr/share/man/man3/tcsetattr.3		comp-c-man		.man
 ./usr/share/man/man3/tcsetpgrp.3		comp-c-man		.man
+./usr/share/man/man3/tcsetwinsize.3		comp-c-man		.man
 ./usr/share/man/man3/td_close.3			comp-obsolete		obsolete
 ./usr/share/man/man3/td_map_pth2thr.3		comp-obsolete		obsolete
 ./usr/share/man/man3/td_open.3			comp-obsolete		obsolete

Index: src/distrib/sets/lists/debug/shl.mi
diff -u src/distrib/sets/lists/debug/shl.mi:1.185 src/distrib/sets/lists/debug/shl.mi:1.186
--- src/distrib/sets/lists/debug/shl.mi:1.185	Tue Oct 10 19:31:57 2017
+++ src/distrib/sets/lists/debug/shl.mi	Wed Oct 25 06:32:59 2017
@@ -1,8 +1,8 @@
-# $NetBSD: shl.mi,v 1.185 2017/10/10 19:31:57 christos Exp $
+# $NetBSD: shl.mi,v 1.186 2017/10/25 06:32:59 kre Exp $
 ./usr/lib/libbfd_g.a						comp-c-debuglib	debuglib,compatfile,binutils
 ./usr/libdata/debug/lib						base-sys-usr	debug,dynamicroot,compatdir
 ./usr/libdata/debug/lib/libblacklist.so.0.0.debug		comp-sys-debug	debug,dynamicroot
-./usr/libdata/debug/lib/libc.so.12.208.debug			comp-sys-debug	debug,dynamicroot
+./usr/libdata/debug/lib/libc.so.12.209.debug			comp-sys-debug	debug,dynamicroot
 ./usr/libdata/debug/lib/libcrypt.so.1.0.debug			comp-sys-debug	debug,dynamicroot
 ./usr/libdata/debug/lib/libcrypto.so.12.0.debug			comp-sys-debug	debug,dynamicroot
 ./usr/libdata/debug/lib/libdevmapper.so.1.0.debug		comp-sys-debug	debug,dynamicroot,lvm
@@ -70,7 +70,7 @@
 ./usr/libdata/debug/usr/lib/libbsdmalloc.so.0.0.debug		comp-sys-debug	debug,compatfile
 ./usr/libdata/debug/usr/lib/libbz2.so.1.1.debug			comp-sys-debug	debug,compatfile
 ./usr/libdata/debug/usr/lib/libc++.so.1.0.debug			comp-sys-debug	debug,compatfile,libcxx
-./usr/libdata/debug/usr/lib/libc.so.12.208.debug		comp-sys-debug	debug,compatfile
+./usr/libdata/debug/usr/lib/libc.so.12.209.debug		comp-sys-debug	debug,compatfile
 ./usr/libdata/debug/usr/lib/libcom_err.so.8.0.debug		comp-krb5-debug	debug,compatfile,kerberos
 ./usr/libdata/debug/usr/lib/libcrypt.so.1.0.debug		comp-sys-debug	debug,compatfile
 ./usr/libdata/debug/usr/lib/libcrypto.so.12.0.debug		comp-crypto-debug	debug,compatfile

Index: src/lib/libc/shlib_version
diff -u src/lib/libc/shlib_version:1.277 src/lib/libc/shlib_version:1.278
--- src/lib/libc/shlib_version:1.277	Thu Oct  5 04:38:08 2017
+++ src/lib/libc/shlib_version	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-#	$NetBSD: shlib_version,v 1.277 2017/10/05 04:38:08 dholland Exp $
+#	$NetBSD: shlib_version,v 1.278 2017/10/25 06:32:59 kre Exp $
 #	Remember to update distrib/sets/lists/base/shl.* when changing
 #
 # things we wish to do on next major version bump:
@@ -52,4 +52,4 @@
 # - clean-up initialisation order between crt0.o, rtld and libc.
 # - move environ and __ps_strings from crt0.o into libc.
 major=12
-minor=208
+minor=209

Index: src/lib/libc/termios/Makefile.inc
diff -u src/lib/libc/termios/Makefile.inc:1.4 src/lib/libc/termios/Makefile.inc:1.5
--- src/lib/libc/termios/Makefile.inc:1.4	Sat Feb 14 20:20:44 1998
+++ src/lib/libc/termios/Makefile.inc	Wed Oct 25 06:32:59 2017
@@ -1,13 +1,16 @@
-#	$NetBSD: Makefile.inc,v 1.4 1998/02/14 20:20:44 kleink Exp $
+#	$NetBSD: Makefile.inc,v 1.5 2017/10/25 06:32:59 kre Exp $
 
 .PATH:	${.CURDIR}/termios
 
 SRCS+=	cfgetispeed.c cfgetospeed.c cfmakeraw.c cfsetispeed.c cfsetospeed.c \
 	cfsetspeed.c tcdrain.c tcflow.c tcflush.c tcgetattr.c tcgetpgrp.c \
-	tcgetsid.c tcsendbreak.c tcsetattr.c tcsetpgrp.c
+	tcgetwinsize.c tcgetsid.c tcsendbreak.c tcsetattr.c tcsetpgrp.c \
+	tcsetwinsize.c
 
-MAN+=	tcgetpgrp.3 tcgetsid.3 tcsendbreak.3 tcsetattr.3 tcsetpgrp.3
+MAN+=	tcgetpgrp.3 tcgetsid.3 tcgetwinsize.3 tcsendbreak.3 tcsetattr.3 \
+	tcsetpgrp.3
 
+MLINKS+=tcgetwinsize.3 tcsetwinsize.3
 MLINKS+=tcsendbreak.3 tcdrain.3 tcsendbreak.3 tcflow.3 \
 	tcsendbreak.3 tcflush.3
 MLINKS+=tcsetattr.3 tcgetattr.3 tcsetattr.3 cfgetispeed.3 \

Index: src/sys/sys/termios.h
diff -u src/sys/sys/termios.h:1.33 src/sys/sys/termios.h:1.34
--- src/sys/sys/termios.h:1.33	Sun Jul 31 21:34:53 2016
+++ src/sys/sys/termios.h	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-/*	$NetBSD: termios.h,v 1.33 2016/07/31 21:34:53 dholland Exp $	*/
+/*	$NetBSD: termios.h,v 1.34 2017/10/25 06:32:59 kre Exp $	*/
 
 /*
  * Copyright (c) 1988, 1989, 1993, 1994
@@ -284,15 +284,17 @@ __END_DECLS
 
 #endif /* !_KERNEL */
 
-#if defined(_NETBSD_SOURCE)
-
 /*
  * Include tty ioctl's that aren't just for backwards compatibility
  * with the old tty driver.  These ioctl definitions were previously
- * in <sys/ioctl.h>.
+ * in <sys/ioctl.h>.   Most of this appears only when _NETBSD_SOURCE
+ * is defined, but (at least) struct winsize has been made standard,
+ * and needs to be visible here (as well as via the old <sys/ioctl.h>.)
  */
 #include <sys/ttycom.h>
-#endif
+
+int	tcgetwinsize(int, struct winsize *);
+int	tcsetwinsize(int, const struct winsize *);
 
 /*
  * END OF PROTECTED INCLUDE.

Index: src/sys/sys/ttycom.h
diff -u src/sys/sys/ttycom.h:1.20 src/sys/sys/ttycom.h:1.21
--- src/sys/sys/ttycom.h:1.20	Fri Oct 19 16:49:21 2012
+++ src/sys/sys/ttycom.h	Wed Oct 25 06:32:59 2017
@@ -1,4 +1,4 @@
-/*	$NetBSD: ttycom.h,v 1.20 2012/10/19 16:49:21 apb Exp $	*/
+/*	$NetBSD: ttycom.h,v 1.21 2017/10/25 06:32:59 kre Exp $	*/
 
 /*-
  * Copyright (c) 1982, 1986, 1990, 1993, 1994
@@ -36,8 +36,8 @@
  *	@(#)ttycom.h	8.1 (Berkeley) 3/28/94
  */
 
-#ifndef	_SYS_TTYCOM_H_
-#define	_SYS_TTYCOM_H_
+#ifndef	_POSIX_SYS_TTYCOM_H_
+#define	_POSIX_SYS_TTYCOM_H_
 
 #include <sys/syslimits.h>
 #include <sys/ioccom.h>
@@ -57,6 +57,18 @@ struct winsize {
 	unsigned short	ws_xpixel;	/* horizontal size, pixels */
 	unsigned short	ws_ypixel;	/* vertical size, pixels */
 };
+#endif /* !_POSIX_SYS_TTYCOM_H_ */
+
+#if defined(_NETBSD_SOURCE) || defined(_SYS_IOCTL_H_)
+
+#ifndef	_NETBSD_SYS_TTYCOM_H_
+#define	_NETBSD_SYS_TTYCOM_H_
+
+/*
+ * The following are not exposed when imported via <termios.h>
+ * when _POSIX_SOURCE (et.al.) is defined (and hence _NETBSD_SOURCE
+ * is not, unless that is added manually.)
+ */
 
 /* ptmget, for /dev/ptm pty getting ioctl TIOCPTMGET, and for TIOCPTSNAME */
 struct ptmget {
@@ -164,4 +176,5 @@ typedef char linedn_t[TTLINEDNAMELEN];
 #define	STRIPDISC	6		/* metricom wireless IP discipline */
 #define	HDLCDISC	9		/* HDLC discipline */
 
-#endif /* !_SYS_TTYCOM_H_ */
+#endif /* !_NETBSD_SYS_TTYCOM_H_ */
+#endif /* _NETBSD_SOURCE || _IOCTL_H */

Added files:

Index: src/lib/libc/termios/tcgetwinsize.3
diff -u /dev/null src/lib/libc/termios/tcgetwinsize.3:1.1
--- /dev/null	Wed Oct 25 06:33:00 2017
+++ src/lib/libc/termios/tcgetwinsize.3	Wed Oct 25 06:32:59 2017
@@ -0,0 +1,217 @@
+.\" $NetBSD: tcgetwinsize.3,v 1.1 2017/10/25 06:32:59 kre Exp $
+.\"
+.\" Copyright (c) 2017 The NetBSD Foundation, Inc.
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd October 25, 2017
+.Dt TCGETWINSIZE 3
+.Os
+.Sh NAME
+.Nm tcgetwinsize ,
+.Nm tcsetwinsize
+.Nd manipulate terminal window size
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In termios.h
+.Fd
+.Ft int
+.Fn tcgetwinsize "int fd" "struct winsize *gws"
+.Fd
+.Ft int
+.Fn tcsetwinsize "int fd" "const struct winsize *sws"
+.Sh DESCRIPTION
+The
+.Nm tcgetwinsize
+function fills in the
+.Ic winsize
+structure pointed to by
+.Fa gws
+with values that represent the size of the
+terminal window for which
+.Fa fd
+provides an open file descriptor.
+If no error occurs
+.Fn tcgetwinsize
+returns zero (0).
+.Pp
+The
+.Nm tcsetwinsize
+function sets the terminal window size,
+for the terminal referenced by
+.Fa fd ,
+to the sizes from the
+.Ic winsize
+structure pointed to by
+.Fa sws .
+If no error occurs
+.Fn tcsetwinsize
+returns zero (0).
+.Pp
+The
+.Ic winsize
+structure, defined in
+.In termios.h ,
+contains (at least) the following four fields
+.Bd -literal
+	unsigned short ws_row;      /* Number of rows, in characters */
+	unsigned short ws_col;      /* Number of columns, in characters */
+	unsigned short ws_xpixel;   /* Width, in pixels */
+	unsigned short ws_ypixel;   /* Height, in pixels */
+.Ed
+.Pp
+If the actual window size of the controlling terminal
+of a process changes, the process is sent a
+.Dv SIGWINCH
+signal.
+See
+.Xr signal 7 .
+Note simply changing the sizes using
+.Fn tcsetwinsize
+does not necessarily change the actual window size,
+and if not, will not generate a
+.Dv SIGWINCH .
+.Sh ERRORS
+If an error occurs,
+.Fn tcgetwinsize
+and
+.Fn tcsetwinsize
+return -1 and cause the global variable
+.Va errno
+to be set to indicate the error.
+Common errors are as follows:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument to
+.Fn tcgetwinsize
+or
+.Fn tcsetwinsize
+is not a valid file descriptor.
+.It Bq Er EFAULT
+The
+.Fa gws
+argument to
+.Fn tcgetwinsize
+does not point to a suitable location
+into which to store the resulting
+.Ic winsize
+structure,
+or the
+.Fa sws
+argument to
+.Fn tcsetwinsize
+does not refer to a suitable location
+from which the
+.Ic winsize
+structure can be obtained.
+.It Bq Er EINVAL
+The values passed in the
+.Ar sws
+.Ic winsize
+structure to
+.Fn tcsetwinsize
+represent an attempt to set the window size to an invalid state.
+.It Bq Er ENOTTY
+The
+.Fa fd
+argument to
+.Fn tcgetwinsize
+or
+.Fn tcsetwinsize
+does not represent a terminal device capable
+of remembering a window size.
+.Sh SEE ALSO
+.Xr stty 1 ,
+.Xr termios 4 ,
+.Xr pty 4 ,
+.Xr tty 4 ,
+.Xr signal 7
+.Sh STANDARDS
+The
+.Nm tcgetwinsize
+and
+.Nm tcsetwinsize
+functions will conform to
+.St -p1003.1
+issue 8, when it is published.
+.Pp
+The
+.Ic ws_xpixel
+and
+.Ic ws_ypixel
+fields are extensions to the standard.
+.Pp
+The standard only requires pseudo-terminals
+.Pq Xr pty 4
+to support these operations.
+In
+.Nx
+all terminal devices can set and recall a window size,
+regardless of whether any actual window exists.
+.Sh HISTORY
+The
+.Fn tcgetwinsize
+and
+.Fn tcsetwinsize
+functions were added in
+.Nx 8.0
+after specification by POSIX
+as more portable alternatives to ancient
+.Ic ioctl
+operations from
+.Bx 4.3 .
+.Sh CAVEATS
+It is unspecified whether calling the
+.Nm tcsetwinsize
+function causes the underlying terminal window to be resized.
+Nor is it specified whether altering the relationship between
+the character fields (ws_row and ws_col) and the pixel fields
+(ws_xpixel and ws_ypixel) causes the font size to change, or
+whether the application is required to maintain any specific
+relationship between these fields.
+In general, the
+.Nm tcsetwinsize
+function is best avoided except by applications responsible
+for actually implementing terminal windows.
+.Pp
+As the
+.Ic winsize
+structure may have more fields than documented, applications
+planning to call
+.Fn tcsetwinsize
+should call
+.Fn tcgetwinsize
+first with the same
+.Ar fd
+parameter, and use the result obtained in
+.Ar *gws
+to initialize the
+.Ic winsize
+structure to be used (after altering fields that are to be changed)
+as the
+.Ar sws
+operand of
+.Nm tcsetwinsize .
Index: src/lib/libc/termios/tcgetwinsize.c
diff -u /dev/null src/lib/libc/termios/tcgetwinsize.c:1.1
--- /dev/null	Wed Oct 25 06:33:00 2017
+++ src/lib/libc/termios/tcgetwinsize.c	Wed Oct 25 06:32:59 2017
@@ -0,0 +1,48 @@
+/*	$NetBSD: tcgetwinsize.c,v 1.1 2017/10/25 06:32:59 kre Exp $	*/
+
+/*-
+ * Copyright (c) 2017 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by 
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: tcgetwinsize.c,v 1.1 2017/10/25 06:32:59 kre Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#ifndef _NETBSD_SOURCE
+#define _NETBSD_SOURCE		/* need the ioctl values to be in <termios.h> */
+#endif
+
+#include <sys/ioctl.h>
+#include <termios.h>
+
+int
+tcgetwinsize(int fd, struct winsize *ws)
+{
+	return ioctl(fd, TIOCGWINSZ, ws);
+}
Index: src/lib/libc/termios/tcsetwinsize.c
diff -u /dev/null src/lib/libc/termios/tcsetwinsize.c:1.1
--- /dev/null	Wed Oct 25 06:33:00 2017
+++ src/lib/libc/termios/tcsetwinsize.c	Wed Oct 25 06:32:59 2017
@@ -0,0 +1,48 @@
+/*	$NetBSD: tcsetwinsize.c,v 1.1 2017/10/25 06:32:59 kre Exp $	*/
+
+/*-
+ * Copyright (c) 2017 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by 
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: tcsetwinsize.c,v 1.1 2017/10/25 06:32:59 kre Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#ifndef _NETBSD_SOURCE
+#define _NETBSD_SOURCE		/* need the ioctl values to be in <termios.h> */
+#endif
+
+#include <sys/ioctl.h>
+#include <termios.h>
+
+int
+tcsetwinsize(int fd, const struct winsize *ws)
+{
+	return ioctl(fd, TIOCSWINSZ, ws);
+}

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