| # 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)" |