/usr/lib/klibc/include/sys/file.h is in libklibc-dev 2.0.3-0ubuntu1.
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 | #ifndef _SYS_FILE_H
#define _SYS_FILE_H
/* LOCK_ definitions */
#include <fcntl.h>
__extern int flock(int, int);
#endif /* _SYS_FILE_H */
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