linux-kernel - Re: problem with <asm/semaphore.h>

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Message-id: <4626BCE5.6090109@shaw.ca>
Date:	Wed, 18 Apr 2007 18:50:45 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	liangbowen <liangbowen@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: problem with <asm/semaphore.h>

liangbowen wrote:
> Hi
> 
> I compiled the following code with gcc under FC2 :
> 
> #include <asm/semaphore.h>
> main()
> {
>     struct semaphore sum;
> 
> }
> 
> It doesn't compile, saying "storage size of `sem'
> isn't known".
> 
> and I looked inside asm/semaphore.h, I saw:
> #ifndef I386_SEMAPHORE_H
> #define I386_SEMAPHORE_H
> 
> #include <linux/linkage.h>
> 
> #endif
> 
> Did I missed something? Please guide me how to fix it.
> 
> Sincerely

You're trying to use a kernel data structure in a user-space program. 
Don't. The definitions in that header are inside #ifdef __KERNEL__ and 
so the provided userspace headers remove that part.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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