diff --git a/headers/posix/termios.h b/headers/posix/termios.h
index 5ff46290a5..5d01343d46 100644
--- a/headers/posix/termios.h
+++ b/headers/posix/termios.h
@@ -181,6 +181,10 @@ struct termios {
 #define TIOCGPGRP			(TCGETA + 15)	/* Gets the process group ID of the TTY device */
 #define TIOCSPGRP			(TCGETA + 16)	/* Sets the process group ID ('pgid' in BeOS) */
 #define TIOCSCTTY			(TCGETA + 17)	/* Become controlling TTY */
+#define TIOCMGET			(TCGETA + 18)	/* get line state, like TCGETBITS */
+#define TIOCMSET			(TCGETA + 19)	/* does TCSETDTR/TCSETRTS */
+#define TIOCSBRK			(TCGETA + 20)	/* set txd pin */
+#define TIOCCBRK			(TCGETA + 21)	/* both are a frontend to TCSBRK */
 
 /* Event codes.  Returned from TCWAITEVENT */
 #define EV_RING			0x0001
@@ -202,6 +206,14 @@ struct winsize {
 #define TCGB_RI			0x04
 #define TCGB_DCD		0x08
 
+/* Bits for the TIOCMGET / TIOCMSET control */
+#define TIOCM_CTS		TCGB_CTS	/* clear to send */
+#define TIOCM_CD		TCGB_DCD	/* carrier detect */
+#define TIOCM_RI		TCGB_RI		/* ring indicator */
+#define TIOCM_DSR		TCGB_DSR	/* dataset ready */
+#define TIOCM_DTR		0x10		/* data terminal ready */
+#define TIOCM_RTS		0x20		/* request to send */
+
 
 #ifdef __cplusplus
 extern "C" {