mozglue/linker/Mappable.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include <fcntl.h>
   6 #include <sys/stat.h>
   7
   8 #include "Mappable.h"
   9
  10 Mappable* Mappable::Create(const char* path) {
  11   int fd = open(path, O_RDONLY);
  12   if (fd != -1) return new Mappable(fd);
  13   return nullptr;
  14 }
  15
  16 MemoryRange Mappable::mmap(const void* addr, size_t length, int prot, int flags,
  17                            off_t offset) {
  18   MOZ_ASSERT(fd && *fd != -1);
  19   MOZ_ASSERT(!(flags & MAP_SHARED));
  20   flags |= MAP_PRIVATE;
  21
  22   return MemoryRange::mmap(const_cast<void*>(addr), length, prot, flags, *fd,
  23                            offset);
  24 }
  25
  26 void Mappable::finalize() {
  27   /* Close file ; equivalent to close(fd.forget()) */
  28   fd.emplace(-1);
  29 }
  30
  31 size_t Mappable::GetLength() const {
  32   struct stat st;
  33   return fstat(*fd, &st) ? 0 : st.st_size;
  34 }