uuid.py 文件源码

def _get_random_reader():
    global _random_reader, _random_init
    if not _random_init:
        try:
            import random
            try:
                _random_reader = open("/dev/urandom","rb").read
            except:
                _random_reader = os.fdopen(os.open("/dev/random",os.O_RDONLY|os.O_NONBLOCK),"rb").read
            sec,usec = _gettimeofday()
            random.seed((os.getpid() << 16) ^ os.getuid() ^ sec ^ usec)
        except:
            pass
        _random_init = True
    sec,usec = _gettimeofday()
    i = (sec ^ usec) & 0x1F
    while i>0:
        _randint(0,_maxint)
        i -= 1
    return _random_reader