1: /* Definitions for BSD-style memory management.
    2:    Copyright (C) 1994-1998,2000,01,02,05 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: /* These are the bits used by 4.4 BSD and its derivatives.  On systems
   21:    (such as GNU) where these facilities are not system services but can be
   22:    emulated in the C library, these are the definitions we emulate.  */
   23: 
   24: #ifndef _SYS_MMAN_H
   25: # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
   26: #endif
   27: 
   28: /* Protections are chosen from these bits, OR'd together.  The
   29:    implementation does not necessarily support PROT_EXEC or PROT_WRITE
   30:    without PROT_READ.  The only guarantees are that no writing will be
   31:    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
   32: 
   33: #define PROT_NONE        0x00 /* No access.  */
   34: #define PROT_READ        0x04 /* Pages can be read.  */
   35: #define PROT_WRITE       0x02        /* Pages can be written.  */
   36: #define PROT_EXEC        0x01 /* Pages can be executed.  */
   37: 
   38: /* Flags contain mapping type, sharing type and options.  */
   39: 
   40: /* Mapping type (must choose one and only one of these).  */
   41: #ifdef __USE_BSD
   42: # define MAP_FILE        0x0001       /* Mapped from a file or device.  */
   43: # define MAP_ANON        0x0002       /* Allocated from anonymous virtual memory.  */
   44: # define MAP_TYPE        0x000f       /* Mask for type field.  */
   45: # ifdef __USE_MISC
   46: #  define MAP_ANONYMOUS  MAP_ANON /* Linux name. */
   47: # endif
   48: #endif
   49: 
   50: /* Sharing types (must choose one and only one of these).  */
   51: #ifdef __USE_BSD
   52: # define MAP_COPY        0x0020       /* Virtual copy of region at mapping time.  */
   53: #endif
   54: #define MAP_SHARED       0x0010      /* Share changes.  */
   55: #define MAP_PRIVATE      0x0000     /* Changes private; copy pages on write.  */
   56: 
   57: /* Other flags.  */
   58: #define MAP_FIXED        0x0100       /* Map address must be exactly as requested. */
   59: #ifdef __USE_BSD
   60: # define MAP_NOEXTEND    0x0200   /* For MAP_FILE, don't change file size.  */
   61: # define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores.  */
   62: # define MAP_INHERIT     0x0800    /* Region is retained after exec.  */
   63: #endif
   64: 
   65: /* Advice to `madvise'.  */
   66: #ifdef __USE_BSD
   67: # define MADV_NORMAL     0 /* No further special treatment.  */
   68: # define MADV_RANDOM     1 /* Expect random page references.  */
   69: # define MADV_SEQUENTIAL 2      /* Expect sequential page references.  */
   70: # define MADV_WILLNEED   3       /* Will need these pages.  */
   71: # define MADV_DONTNEED   4       /* Don't need these pages.  */
   72: #endif
   73: 
   74: /* The POSIX people had to invent similar names for the same things.  */
   75: #ifdef __USE_XOPEN2K
   76: # define POSIX_MADV_NORMAL      0 /* No further special treatment.  */
   77: # define POSIX_MADV_RANDOM      1 /* Expect random page references.  */
   78: # define POSIX_MADV_SEQUENTIAL  2 /* Expect sequential page references.  */
   79: # define POSIX_MADV_WILLNEED    3 /* Will need these pages.  */
   80: # define POSIX_MADV_DONTNEED    4 /* Don't need these pages.  */
   81: #endif
   82: 
   83: /* Flags to `msync'.  */
   84: #define MS_ASYNC        1              /* Sync memory asynchronously.  */
   85: #define MS_SYNC         0              /* Synchronous memory sync.  */
   86: #define MS_INVALIDATE   2         /* Invalidate the caches.  */
   87: 
   88: /* Flags for `mremap'.  */
   89: #ifdef __USE_GNU
   90: # define MREMAP_MAYMOVE 1               /* Mapping address may change.  */
   91: # define MREMAP_FIXED   2         /* Fifth argument sets new address.  */
   92: #endif
   93: 
   94: /* Flags for `mlockall' (can be OR'd together).  */
   95: #define MCL_CURRENT     1           /* Lock all currently mapped pages.  */
   96: #define MCL_FUTURE      2            /* Lock all additions to address
   97:                                            space.  */