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.
 *
 *      @(#)mman.h      7.1 (Berkeley) %G%
 */

/* protections are chosen from these bits, or-ed together */
#define PROT_READ       0x1             /* pages can be read */
#define PROT_WRITE      0x2             /* pages can be written */
#define PROT_EXEC       0x4             /* pages can be executed */

/* sharing types: choose either SHARED or PRIVATE */
#define MAP_SHARED      1               /* share changes */
#define MAP_PRIVATE     2               /* changes are private */

/* 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 */