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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