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39 lines
901 B
39 lines
901 B
#ifndef _LINUX_STDDEF_H |
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#define _LINUX_STDDEF_H |
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#undef NULL |
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#if defined(__cplusplus) |
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#define NULL 0 |
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#else |
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#define NULL ((void *)0) |
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#endif |
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#undef offsetof |
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
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/** |
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* container_of - cast a member of a structure out to the containing structure |
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* |
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* @ptr: the pointer to the member. |
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* @type: the type of the container struct this is embedded in. |
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* @member: the name of the member within the struct. |
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* |
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*/ |
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#define container_of(ptr, type, member) ({ \ |
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
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(type *)( (char *)__mptr - offsetof(type,member) );}) |
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/* |
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* Check at compile time that something is of a particular type. |
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* Always evaluates to 1 so you may use it easily in comparisons. |
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*/ |
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#define typecheck(type,x) \ |
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({ type __dummy; \ |
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typeof(x) __dummy2; \ |
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(void)(&__dummy == &__dummy2); \ |
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1; \ |
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}) |
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#endif
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