tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Mappable.cpp (950B)

      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 }