src/util/map.h

   1 /*
   2  * Copyright (C) the libgit2 contributors. All rights reserved.
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #ifndef INCLUDE_map_h__
   8 #define INCLUDE_map_h__
   9
  10 #include "git2_util.h"
  11
  12
  13 /* p_mmap() prot values */
  14 #define GIT_PROT_NONE 0x0
  15 #define GIT_PROT_READ 0x1
  16 #define GIT_PROT_WRITE 0x2
  17 #define GIT_PROT_EXEC 0x4
  18
  19 /* git__mmmap() flags values */
  20 #define GIT_MAP_FILE    0
  21 #define GIT_MAP_SHARED 1
  22 #define GIT_MAP_PRIVATE 2
  23 #define GIT_MAP_TYPE    0xf
  24 #define GIT_MAP_FIXED   0x10
  25
  26 #ifdef __amigaos4__
  27 #define MAP_FAILED 0
  28 #endif
  29
  30 typedef struct { /* memory mapped buffer        */
  31         void *data; /* data bytes                       */
  32         size_t len; /* data length                      */
  33 #ifdef GIT_WIN32
  34         HANDLE fmh; /* file mapping handle */
  35 #endif
  36 } git_map;
  37
  38 #define GIT_MMAP_VALIDATE(out, len, prot, flags) do { \
  39         GIT_ASSERT(out != NULL && len > 0); \
  40         GIT_ASSERT((prot & GIT_PROT_WRITE) || (prot & GIT_PROT_READ)); \
  41         GIT_ASSERT((flags & GIT_MAP_FIXED) == 0); } while (0)
  42
  43 extern int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, off64_t offset);
  44 extern int p_munmap(git_map *map);
  45
  46 #endif