Function to close all open files and write the contents of all file buffers to disk 函数关闭所有打开的文件,并将所有文件缓冲区的内容写入磁盘。
2.
The space between the end of one record and the beginning of the next record is padded with the existing contents of the file buffer 沿记录长度边界读取后面的记录。一个记录的结尾与下一个记录开头之间的空白由文件缓冲区内的现有内容填充。