improve CTRL+C support on posix platforms
diff --git a/pyserial/examples/miniterm.py b/pyserial/examples/miniterm.py
index 9f4bf21..06f9576 100644
--- a/pyserial/examples/miniterm.py
+++ b/pyserial/examples/miniterm.py
@@ -30,7 +30,7 @@
     fd = sys.stdin.fileno()
     old = termios.tcgetattr(fd)
     new = termios.tcgetattr(fd)
-    new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
+    new[3] = new[3] & ~termios.ICANON & ~termios.ECHO & ~termios.ISIG
     new[6][termios.VMIN] = 1
     new[6][termios.VTIME] = 0
     termios.tcsetattr(fd, termios.TCSANOW, new)