From 112f2da19dbe8dcd8f32b998459298e7c1884c67 Mon Sep 17 00:00:00 2001
From: Dan Williams <dcbw@redhat.com>
Date: Thu, 25 Jun 2009 16:45:49 -0400
Subject: [PATCH] serial-port: open port exclusively

---
 src/mm-serial-port.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/mm-serial-port.c b/src/mm-serial-port.c
index 357fc947..564a8ace 100644
--- a/src/mm-serial-port.c
+++ b/src/mm-serial-port.c
@@ -671,6 +671,14 @@ mm_serial_port_open (MMSerialPort *self, GError **error)
         return FALSE;
     }
 
+    if (ioctl (priv->fd, TIOCEXCL) < 0) {
+        g_set_error (error, MM_SERIAL_ERROR, MM_SERIAL_OPEN_FAILED,
+                     "Could not lock serial device %s: %s", device, strerror (errno));
+        close (priv->fd);
+        priv->fd = -1;
+        return FALSE;
+    }
+
     if (ioctl (priv->fd, TCGETA, &priv->old_t) < 0) {
         g_set_error (error, MM_SERIAL_ERROR, MM_SERIAL_OPEN_FAILED,
                      "Could not open serial device %s: %s", device, strerror (errno));