/usr/lib/bcc/include/sys/file.h is in elks-libc 0.16.17-3.3.
This file is owned by root:root, with mode 0o644.
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 27 28 29 30 31 32 33 34 35 | #ifndef _SYS_FILE_H
#define _SYS_FILE_H
#include <features.h>
#include <fcntl.h>
#ifndef L_SET
#define L_SET 0 /* absolute offset */
#define L_INCR 1 /* relative to current offset */
#define L_XTND 2 /* relative to end of file */
#endif
#ifndef LOCK_SH
/* Operations for the `flock' call. */
#define LOCK_SH 1 /* Shared lock. */
#define LOCK_EX 2 /* Exclusive lock. */
#define LOCK_UN 8 /* Unlock. */
/* Can be OR'd in to one of the above. */
#define LOCK_NB 4 /* Don't block when locking. */
#endif
__BEGIN_DECLS
/* Apply or remove an advisory lock, according to OPERATION,
on the file FD refers to. */
extern int flock __P ((int __fd, int __operation));
__END_DECLS
#endif
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