Update example to no longer use the FCNTL module.
diff --git a/Doc/lib/libsignal.tex b/Doc/lib/libsignal.tex
index 11f0737..fe9b180 100644
--- a/Doc/lib/libsignal.tex
+++ b/Doc/lib/libsignal.tex
@@ -155,7 +155,7 @@
sent, and the handler raises an exception.
\begin{verbatim}
-import signal, os, FCNTL
+import signal, os
def handler(signum, frame):
print 'Signal handler called with signal', signum
@@ -166,7 +166,7 @@
signal.alarm(5)
# This open() may hang indefinitely
-fd = os.open('/dev/ttyS0', FCNTL.O_RDWR)
+fd = os.open('/dev/ttyS0', os.O_RDWR)
signal.alarm(0) # Disable the alarm
\end{verbatim}