test signal module

Lib/test/test_signal.py

@@ -0,0 +1,50 @@
+# Test the signal module
+
+import signal
+import os
+
+
+pid = os.getpid()
+
+# Shell script that will send us asynchronous signals
+script = """
+(
+	set -x
+	sleep 2
+	kill -5 %(pid)d
+	sleep 2
+	kill -2 %(pid)d
+	sleep 2
+	kill -3 %(pid)d
+) &
+""" % vars()
+
+def handlerA(*args):
+	print "handlerA", args
+
+HandlerBCalled = "HandlerBCalled"	# Exception
+
+def handlerB(*args):
+	print "handlerB", args
+	raise HandlerBCalled, args
+
+signal.alarm(20)			# Entire test lasts at most 20 sec.
+signal.signal(5, handlerA)
+signal.signal(2, handlerB)
+signal.signal(3, signal.SIG_IGN)
+signal.signal(signal.SIGALRM, signal.default_int_handler)
+
+os.system(script)
+
+print "starting pause() loop..."
+
+try:
+	while 1:
+		print "call pause()..."
+		try:
+			signal.pause()
+			print "pause() returned"
+		except HandlerBCalled:
+			print "HandlerBCalled exception caught"
+except KeyboardInterrupt:
+	print "KeyboardInterrupt (assume the alarm() went off)"