From 9f90173cbd7b3c79f51b4e9729bcbd91a5c30a71 Mon Sep 17 00:00:00 2001
From: Martin Ling <martin-git@earth.li>
Date: Thu, 14 Nov 2013 21:27:06 +0000
Subject: [PATCH] Retrieve current control line settings in start_config.

---
 serialport.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/serialport.c b/serialport.c
index 58880d4..83cb529 100644
--- a/serialport.c
+++ b/serialport.c
@@ -504,8 +504,24 @@ static int start_config(struct sp_port *port, struct sp_port_data *data)
 	if (!GetCommState(port->hdl, &data->dcb))
 		return SP_ERR_FAIL;
 #else
+	int controlbits;
+
 	if (tcgetattr(port->fd, &data->term) < 0)
 		return SP_ERR_FAIL;
+
+	if (ioctl(port->fd, TIOCMGET, &controlbits) < 0)
+		return SP_ERR_FAIL;
+
+	if (data->term.c_cflag & CRTSCTS) {
+		data->rts = SP_RTS_FLOW_CONTROL;
+		data->cts = SP_CTS_FLOW_CONTROL;
+	} else {
+		data->rts = (controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
+		data->cts = SP_CTS_IGNORE;
+	}
+
+	data->dtr = (controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
+	data->dsr = SP_DSR_IGNORE;
 #endif
 	return SP_OK;
 }