Drop one dependency

tools/utils/tty_linux.go

@@ -0,0 +1,36 @@
+package utils
+
+import "golang.org/x/sys/unix"
+
+const (
+	TCSETS  = 0x5402
+	TCSETSW = 0x5403
+	TCSETSF = 0x5404
+	TCFLSH  = 0x540B
+	TCSBRK  = 0x5409
+	TCSBRKP = 0x5425
+
+	IXON    = 0x00000400
+	IXANY   = 0x00000800
+	IXOFF   = 0x00001000
+	CRTSCTS = 0x80000000
+)
+
+func Tcgetattr(fd int, argp *unix.Termios) error {
+	return unix.IoctlSetTermios(fd, unix.TCGETS, argp)
+}
+
+func Tcsetattr(fd int, action uintptr, argp *unix.Termios) error {
+	var request uintptr
+	switch action {
+	case TCSANOW:
+		request = TCSETS
+	case TCSADRAIN:
+		request = TCSETSW
+	case TCSAFLUSH:
+		request = TCSETSF
+	default:
+		return unix.EINVAL
+	}
+	return unix.IoctlSetTermios(int(fd), uint(request), argp)
+}