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#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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