nsprpub/pr/src/io/prmmap.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /*
   7  *********************************************************************
   8  *
   9  * Memory-mapped files
  10  *
  11  *********************************************************************
  12  */
  13
  14 #include "primpl.h"
  15
  16 PR_IMPLEMENT(PRFileMap*)
  17 PR_CreateFileMap(PRFileDesc* fd, PRInt64 size, PRFileMapProtect prot) {
  18   PRFileMap* fmap;
  19
  20   PR_ASSERT(prot == PR_PROT_READONLY || prot == PR_PROT_READWRITE ||
  21             prot == PR_PROT_WRITECOPY);
  22   fmap = PR_NEWZAP(PRFileMap);
  23   if (NULL == fmap) {
  24     PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
  25     return NULL;
  26   }
  27   fmap->fd = fd;
  28   fmap->prot = prot;
  29   if (_PR_MD_CREATE_FILE_MAP(fmap, size) == PR_SUCCESS) {
  30     return fmap;
  31   }
  32   PR_DELETE(fmap);
  33   return NULL;
  34 }
  35
  36 PR_IMPLEMENT(PRInt32) PR_GetMemMapAlignment(void) {
  37   return _PR_MD_GET_MEM_MAP_ALIGNMENT();
  38 }
  39
  40 PR_IMPLEMENT(void*)
  41 PR_MemMap(PRFileMap* fmap, PROffset64 offset, PRUint32 len) {
  42   return _PR_MD_MEM_MAP(fmap, offset, len);
  43 }
  44
  45 PR_IMPLEMENT(PRStatus) PR_MemUnmap(void* addr, PRUint32 len) {
  46   return _PR_MD_MEM_UNMAP(addr, len);
  47 }
  48
  49 PR_IMPLEMENT(PRStatus) PR_CloseFileMap(PRFileMap* fmap) {
  50   return _PR_MD_CLOSE_FILE_MAP(fmap);
  51 }
  52
  53 PR_IMPLEMENT(PRStatus) PR_SyncMemMap(PRFileDesc* fd, void* addr, PRUint32 len) {
  54   return _PR_MD_SYNC_MEM_MAP(fd, addr, len);
  55 }