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Index: usr.bin/Makefile
===================================================================
--- usr.bin/Makefile
+++ usr.bin/Makefile
@@ -139,6 +139,7 @@
protect \
rctl \
renice \
+ resizewin \
rev \
revoke \
rpcinfo \
Index: usr.bin/resizewin/Makefile
===================================================================
--- /dev/null
+++ usr.bin/resizewin/Makefile
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+PROG= resizewin
+
+.include <bsd.prog.mk>
+
Index: usr.bin/resizewin/resizewin.1
===================================================================
--- /dev/null
+++ usr.bin/resizewin/resizewin.1
@@ -0,0 +1,62 @@
+.\" resizewin
+.\"
+.\" Query terminal for size and inform the kernel
+.\"
+.\" Copyright 2015 EMC / Isilon Storage Division
+.\"
+.\" 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.
+.\"
+.Dd March 17, 2016
+.Dt RESIZEWIN 1
+.Os
+.Sh NAME
+.Nm resizewin
+.Nd update the kernel window size for the current TTY
+.Sh DESCRIPTION
+Query the terminal emulator window size with the
+.Dv TIOCSWINSZ
+ioctl and set the window size known by the kernel to the new values.
+The terminal is assumed to be VT100/ANSI compatible.
+.Nm
+is functionally similar to
+.Xr resize 1 ,
+which is part of the
+.Xr xterm 1
+distribution.
+However,
+.Nm
+only works with VT100/ANSI-compatible terminals and does
+not emit commands to set environment variables.
+.Pp
+After a terminal window has been resized, running
+.Nm
+updates the kernel's window size to match the new size.
+.Pp
+Note that virtually all modern terninals support VT100/ANSI escape
+sequences, including xterm, konsole, gnome-terminal iTerm,
+Terminal.app, and puTTY.
+.Sh SEE ALSO
+.Xr resize 1 ,
+.Xr stty 1
+.Sh HISTORY
+.Nm
+appeared in FreeBSD 11.
Index: usr.bin/resizewin/resizewin.c
===================================================================
--- /dev/null
+++ usr.bin/resizewin/resizewin.c
@@ -0,0 +1,127 @@
+/*
+ * resizewin
+ *
+ * Query terminal for size and inform the kernel
+ *
+ * Copyright 2015 EMC / Isilon Storage Division
+ *
+ * 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.
+ */
+
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <termios.h>
+#include <unistd.h>
+
+/* screen doesn't support ESC[18t (return terminal size) so do it the hard way */
+static const char query[] =
+ "\0337" /* Save cursor position */
+ "\033[r" /* Scroll whole screen */
+ "\033[999;999H" /* Move cursor */
+ "\033[6n" /* Get cursor position */
+ "\0338"; /* Restore cursor position */
+int
+main(__unused int argc, __unused char **argv)
+{
+ struct termios old, new;
+ struct winsize w;
+ int ret, fd, cnt, err;
+ char data[20];
+ struct timeval then, now;
+
+ err = 0;
+
+ if ((fd = open("/dev/tty", O_RDWR | O_NONBLOCK)) == -1)
+ exit(1);
+
+ /* Disable echo */
+ if (tcgetattr(fd, &old) == -1)
+ exit(1);
+
+ new = old;
+ new.c_cflag |= (CLOCAL | CREAD);
+ new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
+ if (tcsetattr(fd, TCSANOW, &new) == -1)
+ exit(1);
+
+ if (write(fd, query, sizeof(query)) != sizeof(query)) {
+ err = 1;
+ goto out;
+ }
+
+ /* Read the response */
+ bzero(data, sizeof(data));
+ gettimeofday(&then, NULL);
+ cnt = 0;
+ while (1) {
+ ret = read(fd, data + cnt, 1);
+
+ if (ret == -1) {
+ if (errno == EAGAIN) {
+ gettimeofday(&now, NULL);
+ timersub(&now, &then, &now);
+ if (now.tv_sec >= 2) {
+ fprintf(stderr, "\n\n\nTimeout reading from terminal\n");
+ fprintf(stderr, "Read %d bytes, %s\n", cnt, data);
+ err = 1;
+ goto out;
+ }
+
+ usleep(20000);
+ continue;
+ }
+ err = 1;
+ goto out;
+ }
+ if (data[cnt] == 'R')
+ break;
+
+ cnt++;
+ if (cnt == sizeof(data) - 2) {
+ fprintf(stderr, "Response too long\n");
+ err = 1;
+ goto out;
+ }
+ }
+
+ /* Parse */
+ if (sscanf(data, "\033[%hu;%huR", &w.ws_row, &w.ws_col) != 2) {
+ err = 1;
+ fprintf(stderr, "Unable to parse response\n");
+ goto out;
+ }
+
+ /* Finally, what we want */
+ if (ioctl(fd, TIOCSWINSZ, &w) == -1)
+ err = 1;
+ out:
+ /* Restore echo */
+ tcsetattr(fd, TCSANOW, &old);
+
+ close(fd);
+ exit(err);
+}

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