src/unix/map.c

   1 /*
   2  * Copyright (C) 2009-2012 the libgit2 contributors
   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 #include <git2/common.h>
   8
   9 #ifndef GIT_WIN32
  10
  11 #include "map.h"
  12 #include <sys/mman.h>
  13 #include <errno.h>
  14
  15 int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
  16 {
  17         int mprot = 0;
  18         int mflag = 0;
  19
  20         GIT_MMAP_VALIDATE(out, len, prot, flags);
  21
  22         out->data = NULL;
  23         out->len = 0;
  24
  25         if (prot & GIT_PROT_WRITE)
  26                 mprot = PROT_WRITE;
  27         else if (prot & GIT_PROT_READ)
  28                 mprot = PROT_READ;
  29
  30         if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
  31                 mflag = MAP_SHARED;
  32         else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
  33                 mflag = MAP_PRIVATE;
  34
  35         out->data = mmap(NULL, len, mprot, mflag, fd, offset);
  36         if (!out->data || out->data == MAP_FAILED) {
  37                 giterr_set(GITERR_OS, "Failed to mmap. Could not write data");
  38                 return -1;
  39         }
  40
  41         out->len = len;
  42
  43         return 0;
  44 }
  45
  46 int p_munmap(git_map *map)
  47 {
  48         assert(map != NULL);
  49         munmap(map->data, map->len);
  50         return 0;
  51 }
  52
  53 #endif
  54