The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/null.h

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    1 /*      $NetBSD: null.h,v 1.9 2010/07/06 11:56:20 kleink Exp $  */
    2 
    3 /*
    4  * Written by Klaus Klein <kleink@NetBSD.org>, December 22, 1999.
    5  * Public domain.
    6  */
    7 
    8 #ifndef _SYS_NULL_H_
    9 #define _SYS_NULL_H_
   10 #ifndef NULL
   11 #if !defined(__GNUG__) || __GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 90)
   12 #if !defined(__cplusplus)
   13 #define NULL    ((void *)0)
   14 #else
   15 #define NULL    0
   16 #endif /* !__cplusplus */
   17 #else
   18 #define NULL    __null
   19 #endif
   20 #endif
   21 #endif /* _SYS_NULL_H_ */

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