From 50993cc77b942c131ab2a65b701301e3b2c3f038 Mon Sep 17 00:00:00 2001
From: Cristian Maglie <c.maglie@bug.st>
Date: Thu, 20 Oct 2016 23:57:09 +0200
Subject: [PATCH] Factorize a function to enable/disable of RTS/CTS handshake
 for unix

---
 serial_unix.go | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/serial_unix.go b/serial_unix.go
index 060cf94..c481ffb 100644
--- a/serial_unix.go
+++ b/serial_unix.go
@@ -72,13 +72,18 @@ func nativeOpen(portName string, mode *Mode) (*unixPort, error) {
 		return nil, &PortError{code: InvalidSerialPort}
 	}
 
-	// Set raw mode
 	settings, err := port.getTermSettings()
 	if err != nil {
 		port.Close()
 		return nil, &PortError{code: InvalidSerialPort}
 	}
+
+	// Set raw mode
 	setRawMode(settings)
+
+	// Explicitly disable RTS/CTS flow control
+	setTermSettingsCtsRts(false, settings)
+
 	if port.setTermSettings(settings) != nil {
 		port.Close()
 		return nil, &PortError{code: InvalidSerialPort}
@@ -199,13 +204,18 @@ func setTermSettingsStopBits(bits StopBits, settings *syscall.Termios) error {
 	return nil
 }
 
+func setTermSettingsCtsRts(enable bool, settings *syscall.Termios) {
+	if enable {
+		settings.Cflag |= termiosMask(tcCRTSCTS)
+	} else {
+		settings.Cflag &= ^termiosMask(tcCRTSCTS)
+	}
+}
+
 func setRawMode(settings *syscall.Termios) {
 	// Set local mode
 	settings.Cflag |= termiosMask(syscall.CREAD | syscall.CLOCAL)
 
-	// Explicitly disable RTS/CTS flow control
-	settings.Cflag &= ^termiosMask(tcCRTSCTS)
-
 	// Set raw mode
 	settings.Lflag &= ^termiosMask(syscall.ICANON | syscall.ECHO | syscall.ECHOE | syscall.ECHOK |
 		syscall.ECHONL | syscall.ECHOCTL | syscall.ECHOPRT | syscall.ECHOKE | syscall.ISIG | syscall.IEXTEN)