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 1.7 2005/12/03 17:10:46 christos Exp $        */
    2 
    3 #ifndef _SYS_NULL_H_
    4 #define _SYS_NULL_H_
    5 #ifndef NULL
    6 #if !defined(__GNUG__) || __GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 90)
    7 #if !defined(__cplusplus)
    8 #define NULL    (void *)0
    9 #else
   10 #define NULL    0
   11 #endif /* !__cplusplus */
   12 #else
   13 #define NULL    __null
   14 #endif
   15 #endif
   16 #endif /* _SYS_NULL_H_ */

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