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Date: Mon, 16 Aug 2010 08:22:44 -0700
From: "Ira W. Snyder" <iws@ovro.caltech.edu>
To: Ravi Gupta <dceravigupta@gmail.com>
Subject: Re: Distinguish between kernel and user space
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On Mon, Aug 16, 2010 at 05:52:41PM +0530, Ravi Gupta wrote:
> Hi,
> 
> I have defined a header file for ioctls macros definitions. I am including
> it in both, my user space application as well as in my device driver. Now
> there are some macros that I want to be visible only in device drive and
> some only in user space application. Is there any set of macros defined in
> linux for such purpose? This is my present header file
> 
> gpio_ioctl.h
> 
> #ifndef _GPIO_IOCTL_H_
> #define _GPIO_IOCTL_H_
> 
> /*
>  * Ioctl definitions
>  */
> 
> /* Use 250 as type/magic number */
> #define GPIO_IOC_MAGIC    250
> #define GPIO_READ         _IOW (GPIO_IOC_MAGIC, 0, int)
> #define GPIO_WRITE        _IOW (GPIO_IOC_MAGIC, 1, int)
> #define GPIO_IOC_MAXNR    2
> 
> 
> #ifdef _DEVICE_DRIVE_ ---> these macros should not be visible in user space
> application
> #define ...
> ...
> ..
> #endif
> 
> #ifdef _USER_SPACE_ ---> these macros should not be visible in device driver
> i.e kernel space
> #define ...
> ...
> ..
> 
> #endif  /*_GPIO_IOCTL_H_ */
> 

#ifdef __KERNEL__
/* kernel only definitions here */
#else
/* userspace only definitions here */
#endif

See tons of headers in include/linux/ for examples.

Ira