check_signals.py 文件源码

def sig_test (sig_handler_type, fork_type, child_output):
    print 'Testing with:'
    print '\tsig_handler_type:', sig_handler_type
    print '\tfork_type:', fork_type
    print '\tchild_output:', child_output

    if sig_handler_type == 'SIG_IGN':
        signal.signal (signal.SIGCHLD, signal.SIG_IGN)
    else:
        signal.signal (signal.SIGCHLD, signal_handler)
    pid = -1
    fd = -1
    if fork_type == 'ptyfork':
        pid, fd = pty.fork()
    else:
        pid = os.fork()

    if pid == 0:
        if child_output == 'yes':
            os.write (sys.stdout.fileno(), 'This is a test.\nThis is a test.')
        time.sleep(10000)

    #print 'Sending SIGKILL to child pid:', pid
    time.sleep(2)
    os.kill (pid, signal.SIGKILL)

    #print 'Entering to sleep...'
    try:
        time.sleep(2)
    except:
        pass
    try:
        os.kill(pid, 0)
        print '\tChild is alive. This is ambiguous because it may be a Zombie.'
    except OSError as e:
        print '\tChild appears to be dead.'
#       print str(e)
    print