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tdlib-fork/tdutils/td/utils/port/FileFd.h
levlam ed33e23c40 Make pread and DataView const.
GitOrigin-RevId: 4267ba93a1e83be55361c9f284f717151eb740cd
2018-09-13 03:12:40 +03:00

71 lines
1.9 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/port/config.h"
#include "td/utils/common.h"
#include "td/utils/port/detail/NativeFd.h"
#include "td/utils/port/detail/PollableFd.h"
#include "td/utils/port/Stat.h"
#include "td/utils/Slice.h"
#include "td/utils/Status.h"
namespace td {
namespace detail {
class FileFdImpl;
}
class FileFd {
public:
FileFd();
FileFd(FileFd &&);
FileFd &operator=(FileFd &&);
~FileFd();
FileFd(const FileFd &) = delete;
FileFd &operator=(const FileFd &) = delete;
enum Flags : int32 { Write = 1, Read = 2, Truncate = 4, Create = 8, Append = 16, CreateNew = 32 };
static Result<FileFd> open(CSlice filepath, int32 flags, int32 mode = 0600) TD_WARN_UNUSED_RESULT;
static FileFd from_native_fd(NativeFd fd) TD_WARN_UNUSED_RESULT;
Result<size_t> write(Slice slice) TD_WARN_UNUSED_RESULT;
Result<size_t> read(MutableSlice slice) TD_WARN_UNUSED_RESULT;
Result<size_t> pwrite(Slice slice, int64 offset) TD_WARN_UNUSED_RESULT;
Result<size_t> pread(MutableSlice slice, int64 offset) const TD_WARN_UNUSED_RESULT;
enum class LockFlags { Write, Read, Unlock };
Status lock(LockFlags flags, int32 max_tries = 1) TD_WARN_UNUSED_RESULT;
PollableFdInfo &get_poll_info();
const PollableFdInfo &get_poll_info() const;
void close();
bool empty() const;
int64 get_size();
Stat stat();
Status sync() TD_WARN_UNUSED_RESULT;
Status seek(int64 position) TD_WARN_UNUSED_RESULT;
Status truncate_to_current_position(int64 current_position) TD_WARN_UNUSED_RESULT;
const NativeFd &get_native_fd() const;
NativeFd move_as_native_fd();
private:
std::unique_ptr<detail::FileFdImpl> impl_;
explicit FileFd(std::unique_ptr<detail::FileFdImpl> impl);
};
} // namespace td