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 #ifndef __amigaos4__
  13 #include <sys/mman.h>
  14 #endif
  15 #include <errno.h>
  16
  17 int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
  18 {
  19         int mprot = 0;
  20         int mflag = 0;
  21
  22         GIT_MMAP_VALIDATE(out, len, prot, flags);
  23
  24         out->data = NULL;
  25         out->len = 0;
  26
  27 #ifndef __amigaos4__
  28         if (prot & GIT_PROT_WRITE)
  29                 mprot = PROT_WRITE;
  30         else if (prot & GIT_PROT_READ)
  31                 mprot = PROT_READ;
  32
  33         if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
  34                 mflag = MAP_SHARED;
  35         else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
  36                 mflag = MAP_PRIVATE;
  37
  38         out->data = mmap(NULL, len, mprot, mflag, fd, offset);
  39 #else
  40         if ((prot & GIT_PROT_WRITE) && ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)) {
  41                 printf("Trying to map shared-writeable file!!!\n");
  42         }
  43
  44         if(out->data = malloc(len)) {
  45                 lseek(fd, offset, SEEK_SET);
  46                 p_read(fd, out->data, len);
  47         }
  48 #endif
  49
  50         if (!out->data || out->data == MAP_FAILED) {
  51                 giterr_set(GITERR_OS, "Failed to mmap. Could not write data");
  52                 return -1;
  53         }
  54
  55         out->len = len;
  56
  57         return 0;
  58 }
  59
  60 int p_munmap(git_map *map)
  61 {
  62         assert(map != NULL);
  63 #ifndef __amigaos4__
  64         munmap(map->data, map->len);
  65 #else
  66         free(map->data);
  67 #endif
  68         return 0;
  69 }
  70
  71 #endif
  72