usr/src/sys/sys/mman.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)mman.h      7.2 (Berkeley) %G%
 */

/*
 * Protections are chosen from these bits, or-ed together
 */
#define PROT_READ       0x04    /* pages can be read */
#define PROT_WRITE      0x02    /* pages can be written */
#define PROT_EXEC       0x01    /* pages can be executed */

/*
 * Flags contain mapping type, sharing type and options.
 * Mapping type; choose one
 */
#define MAP_FILE        0x0001  /* mapped from a file or device */
#define MAP_ANON        0x0002  /* allocated from memory, swap space */
#define MAP_TYPE        0x000f  /* mask for type field */

/*
 * Sharing types; choose one
 */
#define MAP_COPY        0x0020  /* "copy" region at mmap time */
#define MAP_SHARED      0x0010  /* share changes */
#define MAP_PRIVATE     0x0000  /* changes are private */

/*
 * Other flags
 */
#define MAP_FIXED       0x0100  /* map addr must be exactly as requested */
#define MAP_NOEXTEND    0x0200  /* for MAP_FILE, don't change file size */
#define MAP_HASSEMPHORE 0x0400  /* region may contain semaphores */
#define MAP_INHERIT     0x0800  /* region is retained after exec */

/*
 * Advice to madvise
 */
#define MADV_NORMAL     0       /* no further special treatment */
#define MADV_RANDOM     1       /* expect random page references */
#define MADV_SEQUENTIAL 2       /* expect sequential page references */
#define MADV_WILLNEED   3       /* will need these pages */
#define MADV_DONTNEED   4       /* dont need these pages */