/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef	_SYS_FILE_H

#define	_SYS_FILE_H	1

#include <features.h>

#ifndef	_FCNTL_H

# include <fcntl.h>

#endif

__BEGIN_DECLS

/* Alternate names for values for the WHENCE argument to `lseek'.

   These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively.  */

#ifndef L_SET

# define L_SET	0	/* Seek from beginning of file.  */

# define L_INCR	1	/* Seek from current position.  */

# define L_XTND	2	/* Seek from end of file.  */

#endif

/* 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.  */

/* Apply or remove an advisory lock, according to OPERATION,

   on the file FD refers to.  */

extern int flock (int __fd, int __operation) __THROW;

__END_DECLS

#endif /* sys/file.h  */