/usr/lib/klibc/include/sys/mman.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 25 26 | /*
* sys/mman.h
*/
#ifndef _SYS_MMAN_H
#define _SYS_MMAN_H
#include <klibc/extern.h>
#include <sys/types.h>
#include <asm/mman.h>
#define MAP_FAILED ((void *)-1)
__extern void *mmap(void *, size_t, int, int, int, off_t);
__extern int munmap(void *, size_t);
__extern void *mremap(void *, size_t, size_t, unsigned long);
__extern int shm_open(const char *, int, mode_t);
__extern int shm_unlink(const char *);
__extern int msync(const void *, size_t, int);
__extern int mprotect(const void *, size_t, int);
__extern int mlockall(int);
__extern int munlockall(void);
__extern int mlock(const void *, size_t);
__extern int munlock(const void *, size_t);
#endif /* _SYS_MMAN_H */
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