FreeBSD/Linux Kernel Cross Reference
sys/sys/swap.h

     /*      $OpenBSD: swap.h,v 1.7 2013/09/30 12:02:30 millert Exp $        */
     /*      $NetBSD: swap.h,v 1.2 1998/09/13 14:46:24 christos Exp $        */
     
     /*
      * Copyright (c) 1995, 1996, 1998 Matthew R. Green, Tobias Weingartner
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef _SYS_SWAP_H_
    #define _SYS_SWAP_H_
    
    #include <sys/syslimits.h>
    
    /* These structures are used to return swap information for userland */
    struct swapent {
            dev_t   se_dev;                 /* device id */
            int     se_flags;               /* flags */
            int     se_nblks;               /* total blocks */
            int     se_inuse;               /* blocks in use */
            int     se_priority;            /* priority of this device */
            char    se_path[PATH_MAX];      /* path name */
    };
    
    #ifdef _KERNEL
    #define NETDEV          (dev_t)(-2)     /* network device (for nfs swap) */
    #endif /* _KERNEL */
    
    #define SWAP_ON         1               /* begin swapping on device */
    #define SWAP_OFF        2               /* (stop swapping on device) */
    #define SWAP_NSWAP      3               /* how many swap devices ? */
    #define SWAP_STATS      4               /* get device info */
    #define SWAP_CTL        5               /* change priority on device */
    #define SWAP_DUMPDEV    7               /* use this device as dump device */
    
    #define SWF_INUSE       0x00000001      /* in use: we have swapped here */
    #define SWF_ENABLE      0x00000002      /* enabled: we can swap here */
    #define SWF_BUSY        0x00000004      /* busy: I/O happening here */
    #define SWF_FAKE        0x00000008      /* fake: still being built */
    
    #endif /* _SYS_SWAP_H_ */

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