glibc (2.38)
1 /* Calls to enable and disable swapping on specified locations. Linux version.
2 Copyright (C) 1996-2023 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. */
36 extern int swapon (const char *__path, int __flags) __THROW;
37
38 /* Stop using block special device PATH for swapping. */
39 extern int swapoff (const char *__path) __THROW;
40
41 __END_DECLS
42
43 #endif /* _SYS_SWAP_H */
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