root / lab4 / .minix-src / include / sys / null.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: null.h,v 1.9 2010/07/06 11:56:20 kleink Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Written by Klaus Klein <kleink@NetBSD.org>, December 22, 1999.
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| 5 | * Public domain.
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| 6 | */
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| 7 | |||
| 8 | #ifndef _SYS_NULL_H_
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| 9 | #define _SYS_NULL_H_
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| 10 | #ifndef NULL |
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| 11 | #if !defined(__GNUG__) || __GNUG__ < 2 || (__GNUG__ == 2 && __GNUC_MINOR__ < 90) |
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| 12 | #if !defined(__cplusplus)
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| 13 | #define NULL ((void *)0) |
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| 14 | #else
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| 15 | #define NULL 0 |
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| 16 | #endif /* !__cplusplus */ |
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| 17 | #else
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| 18 | #define NULL __null |
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| 19 | #endif
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| 20 | #endif
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| 21 | #endif /* _SYS_NULL_H_ */ |