The read function is unaware of file system types, such as ext3 or NFS.
read函数不了解文件系统的类型，比如ext3或 NFS。
Take, for example, the read function call, which allows some number of bytes to be read from a given file descriptor.
例如，read函数调用可以从指定的文件描述符读取一定数量的字节。
The read function returns the number of bytes read (up to the maximum that you specify), -1 on error, or zero if the end of the file has been reached.
read函数返回读取的字节数（最高为您指定的最大值）；或者 -1，表示错误；或者0，如果已经到达文件末尾。
That is, a Read function could return a pointer to a table object instead of returning a row of data.
也就是说，一个Read函数能够返回一个表对象的指针，而不返回一行数据。
That is, a Read function could return a pointer to a table object instead of returning a row of data.
也就是说，一个Read函数能够返回一个表对象的指针，而不返回一行数据。
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