_twistd_unix.py 文件源码

def startLogging(logfilename, sysLog, prefix, nodaemon):
    if logfilename == '-':
        if not nodaemon:
            print 'daemons cannot log to stdout'
            os._exit(1)
        logFile = sys.stdout
    elif sysLog:
        syslog.startLogging(prefix)
    elif nodaemon and not logfilename:
        logFile = sys.stdout
    else:
        logFile = app.getLogFile(logfilename or 'twistd.log')
        try:
            import signal
        except ImportError:
            pass
        else:
            def rotateLog(signal, frame):
                from twisted.internet import reactor
                reactor.callFromThread(logFile.rotate)
            signal.signal(signal.SIGUSR1, rotateLog)

    if not sysLog:
        log.startLogging(logFile)
    sys.stdout.flush()