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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
1234567891011121314151617181920212223242526272829303132333435363738394041/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_CONTAINER_OF_H#define _LINUX_CONTAINER_OF_H
#include <linux/build_bug.h>#include <linux/stddef.h>
#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. * * WARNING: any const qualifier of @ptr is lost. * Do not use container_of() in new code. */#define container_of(ptr, type, member) ({ \ static_assert(__same_type(*(ptr), typeof_member(type, member)) || \ __same_type(*(ptr), void), \ "pointer type mismatch in container_of()"); \ (type *)((void *)(ptr) - offsetof(type, member)); })
/** * container_of_const - cast a member of a structure out to the containing * structure and preserve the const-ness of the pointer * @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. * * Always prefer container_of_const() instead of container_of() in new code. */#define container_of_const(ptr, type, member) \ _Generic(ptr, \ const typeof(*(ptr)) *: ((const type *)container_of(ptr, type, member)),\ default: ((type *)container_of(ptr, type, member)) \ )
#endif /* _LINUX_CONTAINER_OF_H */