1/* Calls to enable and disable swapping on specified locations. Linux version.
2 Copyright (C) 1996-2022 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 */
44

source code of glibc/sysdeps/unix/sysv/linux/sys/swap.h