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Re: Use of EXPORT_SYMBOL

To: "rishi agrawal" <postrishi@xxxxxxxxx>
Subject: Re: Use of EXPORT_SYMBOL
From: "Mulyadi Santosa" <mulyadi.santosa@xxxxxxxxx>
Date: Mon, 8 Sep 2008 14:10:55 +0700
Cc: "Kernel Newbies" <kernelnewbies@xxxxxxxxxxxx>
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Hi...

On Sun, Sep 7, 2008 at 5:34 PM, rishi agrawal <postrishi@xxxxxxxxx> wrote:
> Hello Everybody,
>
> What is the use of EXPORT_SYMBOL ??

To make it short, by doing that you make that symbol "visible" to
kernel module. By visible, I mean it can be referenced. Thus if it's
variable you can store a value or retrieve the content, if it's
procedure then you can call it.

The mechanism is quite similar in normal user space programming. By
declaring a variable as non static and you refer it on another object
code as extern, then run time linking will make the latter object code
able to refer the symbol.

regards,

Mulyadi.

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References:
- Use of EXPORT_SYMBOL
  - From: rishi agrawal

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