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// file.h cross platform basic file class. supports 64 bit offsets and such.
/* Copyright 2009 10gen Inc.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
#pragma once
#include <cstdint>
#include <string>
#include "mongo/platform/basic.h"
namespace mongo {
typedef uint64_t fileofs;
// NOTE: not thread-safe. (at least the windows implementation isn't)
class File {
bool bad() const {
return _bad;
void fsync() const;
bool is_open() const;
fileofs len();
void open(const char* filename, bool readOnly = false, bool direct = false);
void read(fileofs o, char* data, unsigned len);
void truncate(fileofs size);
void write(fileofs o, const char* data, unsigned len);
static intmax_t freeSpace(const std::string& path);
bool _bad;
#ifdef _WIN32
HANDLE _handle;
int _fd;
std::string _name;