1/* Calls to enable and disable swapping on specified locations.  Linux version.
 2   Copyright (C) 1996-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef _SYS_SWAP_H
20
21#define _SYS_SWAP_H	1
22#include <features.h>
23
24/* The swap priority is encoded as:
25   (prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK
26*/
27#define	SWAP_FLAG_PREFER	0x8000	/* Set if swap priority is specified. */
28#define	SWAP_FLAG_PRIO_MASK	0x7fff
29#define	SWAP_FLAG_PRIO_SHIFT	0
30#define SWAP_FLAG_DISCARD	0x10000	/* Discard swap cluster after use.  */
31
32__BEGIN_DECLS
33
34/* Make the block special device PATH available to the system for swapping.
35   This call is restricted to the super-user.  */
36extern int swapon (const char *__path, int __flags) __THROW;
37
38/* Stop using block special device PATH for swapping.  */
39extern int swapoff (const char *__path) __THROW;
40
41__END_DECLS
42
43#endif /* _SYS_SWAP_H */