The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mman.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)mman.h      8.2 (Berkeley) 1/9/95
   30  * $FreeBSD: releng/8.1/sys/sys/mman.h 199583 2009-11-20 15:27:52Z jhb $
   31  */
   32 
   33 #ifndef _SYS_MMAN_H_
   34 #define _SYS_MMAN_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/_types.h>
   38 
   39 #if __BSD_VISIBLE
   40 /*
   41  * Inheritance for minherit()
   42  */
   43 #define INHERIT_SHARE   0
   44 #define INHERIT_COPY    1
   45 #define INHERIT_NONE    2
   46 #endif
   47 
   48 /*
   49  * Protections are chosen from these bits, or-ed together
   50  */
   51 #define PROT_NONE       0x00    /* no permissions */
   52 #define PROT_READ       0x01    /* pages can be read */
   53 #define PROT_WRITE      0x02    /* pages can be written */
   54 #define PROT_EXEC       0x04    /* pages can be executed */
   55 
   56 /*
   57  * Flags contain sharing type and options.
   58  * Sharing types; choose one.
   59  */
   60 #define MAP_SHARED      0x0001          /* share changes */
   61 #define MAP_PRIVATE     0x0002          /* changes are private */
   62 #if __BSD_VISIBLE
   63 #define MAP_COPY        MAP_PRIVATE     /* Obsolete */
   64 #endif
   65 
   66 /*
   67  * Other flags
   68  */
   69 #define MAP_FIXED        0x0010 /* map addr must be exactly as requested */
   70 
   71 #if __BSD_VISIBLE
   72 #define MAP_RENAME       0x0020 /* Sun: rename private pages to file */
   73 #define MAP_NORESERVE    0x0040 /* Sun: don't reserve needed swap area */
   74 #define MAP_RESERVED0080 0x0080 /* previously misimplemented MAP_INHERIT */
   75 #define MAP_RESERVED0100 0x0100 /* previously unimplemented MAP_NOEXTEND */
   76 #define MAP_HASSEMAPHORE 0x0200 /* region may contain semaphores */
   77 #define MAP_STACK        0x0400 /* region grows down, like a stack */
   78 #define MAP_NOSYNC       0x0800 /* page to but do not sync underlying file */
   79 
   80 /*
   81  * Mapping type
   82  */
   83 #define MAP_FILE         0x0000 /* map from file (default) */
   84 #define MAP_ANON         0x1000 /* allocated from memory, swap space */
   85 
   86 /*
   87  * Extended flags
   88  */
   89 #define MAP_NOCORE       0x00020000 /* dont include these pages in a coredump */
   90 #endif /* __BSD_VISIBLE */
   91 
   92 #if __POSIX_VISIBLE >= 199309
   93 /*
   94  * Process memory locking
   95  */
   96 #define MCL_CURRENT     0x0001  /* Lock only current memory */
   97 #define MCL_FUTURE      0x0002  /* Lock all future memory as well */
   98 #endif
   99 
  100 /*
  101  * Error return from mmap()
  102  */
  103 #define MAP_FAILED      ((void *)-1)
  104 
  105 /*
  106  * msync() flags
  107  */
  108 #define MS_SYNC         0x0000  /* msync synchronously */
  109 #define MS_ASYNC        0x0001  /* return immediately */
  110 #define MS_INVALIDATE   0x0002  /* invalidate all cached data */
  111 
  112 /*
  113  * Advice to madvise
  114  */
  115 #define _MADV_NORMAL    0       /* no further special treatment */
  116 #define _MADV_RANDOM    1       /* expect random page references */
  117 #define _MADV_SEQUENTIAL 2      /* expect sequential page references */
  118 #define _MADV_WILLNEED  3       /* will need these pages */
  119 #define _MADV_DONTNEED  4       /* dont need these pages */
  120 
  121 #if __BSD_VISIBLE
  122 #define MADV_NORMAL     _MADV_NORMAL
  123 #define MADV_RANDOM     _MADV_RANDOM
  124 #define MADV_SEQUENTIAL _MADV_SEQUENTIAL
  125 #define MADV_WILLNEED   _MADV_WILLNEED
  126 #define MADV_DONTNEED   _MADV_DONTNEED
  127 #define MADV_FREE       5       /* dont need these pages, and junk contents */
  128 #define MADV_NOSYNC     6       /* try to avoid flushes to physical media */
  129 #define MADV_AUTOSYNC   7       /* revert to default flushing strategy */
  130 #define MADV_NOCORE     8       /* do not include these pages in a core file */
  131 #define MADV_CORE       9       /* revert to including pages in a core file */
  132 #define MADV_PROTECT    10      /* protect process from pageout kill */
  133 
  134 /*
  135  * Return bits from mincore
  136  */
  137 #define MINCORE_INCORE           0x1 /* Page is incore */
  138 #define MINCORE_REFERENCED       0x2 /* Page has been referenced by us */
  139 #define MINCORE_MODIFIED         0x4 /* Page has been modified by us */
  140 #define MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */
  141 #define MINCORE_MODIFIED_OTHER  0x10 /* Page has been modified */
  142 #define MINCORE_SUPER           0x20 /* Page is a "super" page */
  143 
  144 /*
  145  * Anonymous object constant for shm_open().
  146  */
  147 #define SHM_ANON                ((char *)1)
  148 #endif /* __BSD_VISIBLE */
  149 
  150 /*
  151  * XXX missing POSIX_TYPED_MEM_* macros and
  152  * posix_typed_mem_info structure.
  153  */
  154 #if __POSIX_VISIBLE >= 200112
  155 #define POSIX_MADV_NORMAL       _MADV_NORMAL
  156 #define POSIX_MADV_RANDOM       _MADV_RANDOM
  157 #define POSIX_MADV_SEQUENTIAL   _MADV_SEQUENTIAL
  158 #define POSIX_MADV_WILLNEED     _MADV_WILLNEED
  159 #define POSIX_MADV_DONTNEED     _MADV_DONTNEED
  160 #endif
  161 
  162 #ifndef _MODE_T_DECLARED
  163 typedef __mode_t        mode_t;
  164 #define _MODE_T_DECLARED
  165 #endif
  166 
  167 #ifndef _OFF_T_DECLARED
  168 typedef __off_t         off_t;
  169 #define _OFF_T_DECLARED
  170 #endif
  171 
  172 #ifndef _SIZE_T_DECLARED
  173 typedef __size_t        size_t;
  174 #define _SIZE_T_DECLARED
  175 #endif
  176 
  177 #ifdef _KERNEL
  178 #include <vm/vm.h>
  179 
  180 struct shmfd {
  181         size_t          shm_size;
  182         vm_object_t     shm_object;
  183         int             shm_refs;
  184         uid_t           shm_uid;
  185         gid_t           shm_gid;
  186         mode_t          shm_mode;
  187 
  188         /*
  189          * Values maintained solely to make this a better-behaved file
  190          * descriptor for fstat() to run on.
  191          */
  192         struct timespec shm_atime;
  193         struct timespec shm_mtime;
  194         struct timespec shm_ctime;
  195         struct timespec shm_birthtime;
  196 
  197         struct label    *shm_label;             /* MAC label */
  198 };
  199 
  200 int     shm_mmap(struct shmfd *shmfd, vm_size_t objsize, vm_ooffset_t foff,
  201             vm_object_t *obj);
  202 
  203 #else /* !_KERNEL */
  204 
  205 __BEGIN_DECLS
  206 /*
  207  * XXX not yet implemented: posix_mem_offset(), posix_typed_mem_get_info(),
  208  * posix_typed_mem_open().
  209  */
  210 #if __BSD_VISIBLE
  211 int     getpagesizes(size_t *, int);
  212 int     madvise(void *, size_t, int);
  213 int     mincore(const void *, size_t, char *);
  214 int     minherit(void *, size_t, int);
  215 #endif
  216 int     mlock(const void *, size_t);
  217 #ifndef _MMAP_DECLARED
  218 #define _MMAP_DECLARED
  219 void *  mmap(void *, size_t, int, int, int, off_t);
  220 #endif
  221 int     mprotect(const void *, size_t, int);
  222 int     msync(void *, size_t, int);
  223 int     munlock(const void *, size_t);
  224 int     munmap(void *, size_t);
  225 #if __POSIX_VISIBLE >= 200112
  226 int     posix_madvise(void *, size_t, int);
  227 #endif
  228 #if __POSIX_VISIBLE >= 199309
  229 int     mlockall(int);
  230 int     munlockall(void);
  231 int     shm_open(const char *, int, mode_t);
  232 int     shm_unlink(const char *);
  233 #endif
  234 __END_DECLS
  235 
  236 #endif /* !_KERNEL */
  237 
  238 #endif /* !_SYS_MMAN_H_ */

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