Very Computer

by **aldo.gaviol** » Sat, 04 Nov 2000 01:53:49

How do I read/write normal files from within a kernel module? Where
shall I look in the source code for the implementation of read() system
call??? I couldn't figure out where it is.
Please help.

by **Peter T. Breue** » Sat, 04 Nov 2000 02:42:44

: How do I read/write normal files from within a kernel module? Where

You don't. (there is code in 2.4.* kernels to make this possible,
however).

: shall I look in the source code for the implementation of read() system
: call??? I couldn't figure out where it is.

It's nowhere and everywhere. Each block device will provide it's own
implementation of read. They'll be read/write of BLOCKs, however.
It'll be your file system that translates r/w calls on FILEs to r/w
calls on blocks.

Peter

by **Mike Cast** » Sat, 04 Nov 2000 03:30:24

> How do I read/write normal files from within a kernel module? Where
>shall I look in the source code for the implementation of read() system
>call??? I couldn't figure out where it is.
> Please help.

Generally, don't do that. It is a lot of hassle, and prone to problems.

Instead, have a user mode helper application send it to you.

This has been discussed on linux-kernel several times.

Here is one particular response:
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0005.3/0061.html

More can be found at:
http://www.uwsg.indiana.edu/hypermail/linux/kernel/index.html

Do a search on "open file kernel mode"

mrc
--
Mike Castle Life is like a clock: You can work constantly

www.netcom.com/~dalgoda/ and be right at least twice a day. -- mrc
We are all of us living in the shadow of Manhattan. -- Watchmen

Very Computer

accessing files from within a kernel module

accessing files from within a kernel module

accessing files from within a kernel module

accessing files from within a kernel module