daemon.py 文件源码

def close_open_files():
    '''Closes all open files. Useful after a fork.'''

    maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
    if maxfd == resource.RLIM_INFINITY:
        maxfd = MAXFD

    for fd in reversed(range(maxfd)):
        try:
            os.close(fd)
        except OSError, e:
            if e.errno == errno.EBADF:
                pass # File not open
            else:
                raise Exception("Failed to close file descriptor %d: %s" % (fd, e))