请问proc文件系统--read_proc()

一千年

想通过proc文件系统读取内核数据

但read_proc的eof该什么时候设置？read_proc该如何写？

看了些许文档, 但还是不理解，请指教

* How to be a proc read function
* ------------------------------
* Prototype:
*    int f(char *buffer, char **start, off_t offset,
*          int count, int *peof, void *dat)
*
* Assume that the buffer is "count" bytes in size.
*
* If you know you have supplied all the data you
* have, set *peof.
*
* You have three ways to return data:
* 0) Leave *start = NULL.  (This is the default.)
*    Put the data of the requested offset at that
*    offset within the buffer.  Return the number (n)
*    of bytes there are from the beginning of the
*    buffer up to the last byte of data.  If the
*    number of supplied bytes (= n - offset) is
*    greater than zero and you didn't signal eof
*    and the reader is prepared to take more data
*    you will be called again with the requested
*    offset advanced by the number of bytes
*    absorbed.  This interface is useful for files
*    no larger than the buffer.