34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_CONTAINER_OF_H
|
|
#define _LINUX_CONTAINER_OF_H
|
|
|
|
#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
|
|
|
|
#define typeof_member(T, m) typeof(((T*)0)->m)
|
|
|
|
/**
|
|
* container_of - cast a member of a structure out to the containing structure
|
|
* @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.
|
|
*
|
|
*/
|
|
#define container_of(ptr, type, member) ({ \
|
|
void *__mptr = (void *)(ptr); \
|
|
((type *)(__mptr - offsetof(type, member))); })
|
|
|
|
/**
|
|
* container_of_safe - cast a member of a structure out to the containing structure
|
|
* @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.
|
|
*
|
|
* If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
|
|
*/
|
|
#define container_of_safe(ptr, type, member) ({ \
|
|
void *__mptr = (void *)(ptr); \
|
|
IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \
|
|
((type *)(__mptr - offsetof(type, member))); })
|
|
|
|
#endif /* _LINUX_CONTAINER_OF_H */
|