tor/src/lib/fs/mmap.h

/* Copyright (c) 2003-2004, Roger Dingledine
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2018, The Tor Project, Inc. */
/* See LICENSE for licensing information */

/**
 * \file mmap.h
 *
 * \brief Header for mmap.c
 **/

#ifndef TOR_MMAP_H
#define TOR_MMAP_H

#include "lib/cc/compat_compiler.h"
#include <stddef.h>

#ifdef _WIN32
#include <windef.h>
#endif

/** Represents an mmaped file. Allocated via tor_mmap_file; freed with
 * tor_munmap_file. */
typedef struct tor_mmap_t {
  const char *data; /**< Mapping of the file's contents. */
  size_t size; /**< Size of the file. */

  /* None of the fields below should be accessed from outside compat.c */
#ifdef HAVE_MMAP
  size_t mapping_size; /**< Size of the actual mapping. (This is this file
                        * size, rounded up to the nearest page.) */
#elif defined _WIN32
  HANDLE mmap_handle;
#endif /* defined(HAVE_MMAP) || ... */

} tor_mmap_t;

tor_mmap_t *tor_mmap_file(const char *filename);
int tor_munmap_file(tor_mmap_t *handle);

#endif