FreeBSD/Linux Kernel Cross Reference
sys/bsd/vm/vm_pager.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
      * Version 2.0 (the 'License'). You may not use this file except in
      * compliance with the License. The rights granted to you under the License
     * may not be used to create, or enable the creation or redistribution of,
     * unlawful or unlicensed copies of an Apple operating system, or to
     * circumvent, violate, or enable the circumvention or violation of, any
     * terms of an Apple operating system software license agreement.
     * 
     * Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1987 Carnegie-Mellon University
     * All rights reserved.  The CMU software License Agreement specifies
     * the terms and conditions for use and redistribution.
     */
    /*
     *      File:   vm_pager.h
     *      Author: Avadis Tevanian, Jr., Michael Wayne Young
     *
     *      Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
     *      Copyright (C) 1985, Avadis Tevanian, Jr., Michael Wayne Young
     *
     *      Pager routine interface definition
     */
    
    #ifndef _VM_PAGER_
    #define _VM_PAGER_
    
    #include <mach/boolean.h>
    
    struct  pager_struct {
            boolean_t       is_device;
    };
    typedef struct pager_struct     *vm_pager_t;
    #define vm_pager_null           ((vm_pager_t) 0)
    
    #define PAGER_SUCCESS           0  /* page read or written */
    #define PAGER_ABSENT            1  /* pager does not have page */
    #define PAGER_ERROR             2  /* pager unable to read or write page */
    
    #ifdef  KERNEL
    typedef int             pager_return_t;
    
    extern vm_pager_t               vm_pager_allocate(void);
    extern void                             vm_pager_deallocate(void);
    extern pager_return_t   vm_pager_get(void);
    extern pager_return_t   vm_pager_put(void);
    extern boolean_t                vm_pager_has_page(void);
    #endif  /* KERNEL */
    
    #endif  /* _VM_PAGER_ */

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