helpers.h File Reference

#include <commonlib/bsd/helpers.h>

Include dependency graph for helpers.h:

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Macros
#define	DIV_ROUND_CLOSEST(x, divisor)
#define	container_of(ptr, type, member)
	container_of - cast a member of a structure out to the containing structure More...
#define	__unused   __attribute__((unused))
#define	alloca(x)   __builtin_alloca(x)

Macro Definition Documentation

__unused

#define __unused   __attribute__((unused))

Definition at line 38 of file helpers.h.

alloca

#define alloca

(

x

)

__builtin_alloca(x)

Definition at line 42 of file helpers.h.

container_of

#define container_of	(		ptr,
			type,
			member
	)

Value:

        ({                      \
        const __typeof__(((type *)0)->member) *__mptr = (ptr);  \
        (type *)((char *)__mptr - offsetof(type, member)); })

container_of - cast a member of a structure out to the containing structure

Parameters

ptr	the pointer to the member.
type	the type of the container struct this is embedded in.
member	the name of the member within the struct.

Definition at line 33 of file helpers.h.

DIV_ROUND_CLOSEST

#define DIV_ROUND_CLOSEST	(		x,
			divisor
	)

Value:

        ({                                      \
        __typeof__(x) _div_local_x = (x);                               \
        __typeof__(divisor) _div_local_d = (divisor);                   \
        (((__typeof__(x))-1) > 0 ||                                     \
         ((__typeof__(divisor))-1) > 0 || (_div_local_x) > 0) ?         \
                ((_div_local_x + (_div_local_d / 2)) / _div_local_d) :  \
                ((_div_local_x - (_div_local_d / 2)) / _div_local_d);   \
})

Definition at line 17 of file helpers.h.