Index: include/termios.h
===================================================================
--- include/termios.h
+++ include/termios.h
@@ -85,6 +85,8 @@
 
 #if __POSIX_VISIBLE >= 200112
 pid_t	tcgetsid(int);
+int	tcgetwinsize(int, struct winsize *);
+int	tcsetwinsize(int, const struct winsize *);
 #endif
 #if __BSD_VISIBLE
 int	tcsetsid(int, pid_t);
@@ -98,6 +100,5 @@
 #endif /* !_TERMIOS_H_ */
 
 #if __BSD_VISIBLE
-#include <sys/ttycom.h>
 #include <sys/ttydefaults.h>
 #endif
Index: lib/libc/gen/Symbol.map
===================================================================
--- lib/libc/gen/Symbol.map
+++ lib/libc/gen/Symbol.map
@@ -428,6 +428,8 @@
 	sigandset;
 	sigisemptyset;
 	sigorset;
+	tcgetwinsize;
+	tcsetwinsize;
 };
 
 FBSDprivate_1.0 {
Index: lib/libc/gen/termios.c
===================================================================
--- lib/libc/gen/termios.c
+++ lib/libc/gen/termios.c
@@ -275,3 +275,17 @@
 	}
 	/* NOTREACHED */
 }
+
+int
+tcgetwinsize(int fd, struct winsize *w)
+{
+
+	return (_ioctl(fd, TIOCGWINSZ, w));
+}
+
+int
+tcsetwinsize(int fd, const struct winsize *w)
+{
+
+	return (_ioctl(fd, TIOCSWINSZ, w));
+}
Index: sys/sys/_termios.h
===================================================================
--- sys/sys/_termios.h
+++ sys/sys/_termios.h
@@ -227,4 +227,20 @@
 	speed_t		c_ospeed;	/* output speed */
 };
 
+#if __POSIX_VISIBLE >= 200112
+#ifndef _STRUCT_WINSIZE_DEFINED
+#define _STRUCT_WINSIZE_DEFINED
+/*
+ * Window/terminal size structure.  This information is stored by the kernel
+ * in order to provide a consistent interface, but is not used by the kernel.
+ */
+struct winsize {
+	unsigned short	ws_row;		/* rows, in characters */
+	unsigned short	ws_col;		/* columns, in characters */
+	unsigned short	ws_xpixel;	/* horizontal size, pixels */
+	unsigned short	ws_ypixel;	/* vertical size, pixels */
+};
+#endif /* !_STRUCT_WINSIZE_DEFINED */
+#endif /* __POSIX_VISIBLE >= 200112 */
+
 #endif /* !_SYS__TERMIOS_H_ */
Index: sys/sys/ttycom.h
===================================================================
--- sys/sys/ttycom.h
+++ sys/sys/ttycom.h
@@ -47,6 +47,8 @@
  * with the old tty driver.
  */
 
+#ifndef _STRUCT_WINSIZE_DEFINED
+#define _STRUCT_WINSIZE_DEFINED
 /*
  * Window/terminal size structure.  This information is stored by the kernel
  * in order to provide a consistent interface, but is not used by the kernel.
@@ -57,6 +59,7 @@
 	unsigned short	ws_xpixel;	/* horizontal size, pixels */
 	unsigned short	ws_ypixel;	/* vertical size, pixels */
 };
+#endif /* !_STRUCT_WINSIZE_DEFINED */
 
 						/* 0-2 compat */
 						/* 3-7 unused */