/usr/lib/klibc/include/stddef.h is in libklibc-dev 1.5.25-1ubuntu2.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | /*
* stddef.h
*/
#ifndef _STDDEF_H
#define _STDDEF_H
#ifndef __KLIBC__
# error "__KLIBC__ not defined, compiler invocation error!"
#endif
#include <bitsize/stddef.h>
#undef NULL
#ifdef __cplusplus
# define NULL 0
#else
# define NULL ((void *)0)
#endif
#undef offsetof
#define offsetof(t,m) ((size_t)&((t *)0)->m)
#endif /* _STDDEF_H */
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