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      1 /*	$NetBSD: swap.h,v 1.10 2026/03/23 23:44:12 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995, 1996, 1998, 2009 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _SYS_SWAP_H_
     29 #define _SYS_SWAP_H_
     30 
     31 #include <sys/syslimits.h>
     32 
     33 /* This structure is used to return swap information for userland */
     34 
     35 struct swapent {
     36 	dev_t	se_dev;			/* device id */
     37 	int	se_flags;		/* flags */
     38 	int	se_nblks;		/* total blocks */
     39 	int	se_inuse;		/* blocks in use */
     40 	int	se_priority;		/* priority of this device */
     41 	char	se_path[PATH_MAX+1];	/* path name */
     42 	char	se_reserved1[7];	/* padding for 8-byte alignment */
     43 	int	se_npgbad;		/* bad pages */
     44 	int	se_reserved2[31];	/* reserved for future use */
     45 };
     46 
     47 __CTASSERT(sizeof(struct swapent) == 1184); /* user abi */
     48 
     49 #define SWAP_ON		1		/* begin swapping on device */
     50 #define SWAP_OFF	2		/* stop swapping on device */
     51 #define SWAP_NSWAP	3		/* how many swap devices ? */
     52 #define SWAP_STATS13	4		/* old SWAP_STATS, no se_path */
     53 #define SWAP_CTL	5		/* change priority on device */
     54 #define SWAP_STATS50	6		/* old SWAP_STATS, 32 bit dev_t */
     55 #define SWAP_DUMPDEV	7		/* use this device as dump device */
     56 #define SWAP_GETDUMPDEV	8		/* use this device as dump device */
     57 #define SWAP_DUMPOFF	9		/* stop using the dump device */
     58 #define SWAP_STATS110	10		/* get device info */
     59 #define SWAP_STATS	11		/* get device info */
     60 
     61 #define SWF_INUSE	0x00000001	/* in use: we have swapped here */
     62 #define SWF_ENABLE	0x00000002	/* enabled: we can swap here */
     63 #define SWF_BUSY	0x00000004	/* busy: I/O happening here */
     64 #define SWF_FAKE	0x00000008	/* fake: still being built */
     65 
     66 #endif /* _SYS_SWAP_H_ */
     67