error_code.ipp
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//
// impl/error_code.ipp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef ASIO_IMPL_ERROR_CODE_IPP
#define ASIO_IMPL_ERROR_CODE_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
# include <winerror.h>
#elif defined(ASIO_WINDOWS_RUNTIME)
# include <windows.h>
#else
# include <cerrno>
# include <cstring>
# include <string>
#endif
#include "asio/detail/local_free_on_block_exit.hpp"
#include "asio/detail/socket_types.hpp"
#include "asio/error_code.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class system_category : public error_category
{
public:
const char* name() const ASIO_ERROR_CATEGORY_NOEXCEPT
{
return "asio.system";
}
std::string message(int value) const
{
#if defined(ASIO_WINDOWS_RUNTIME) || defined(ASIO_WINDOWS_APP)
std::wstring wmsg(128, wchar_t());
for (;;)
{
DWORD wlength = ::FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS, 0, value,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
&wmsg[0], static_cast<DWORD>(wmsg.size()), 0);
if (wlength == 0 && ::GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
wmsg.resize(wmsg.size() + wmsg.size() / 2);
continue;
}
if (wlength && wmsg[wlength - 1] == '\n')
--wlength;
if (wlength && wmsg[wlength - 1] == '\r')
--wlength;
if (wlength)
{
std::string msg(wlength * 2, char());
int length = ::WideCharToMultiByte(CP_ACP, 0,
wmsg.c_str(), static_cast<int>(wlength),
&msg[0], static_cast<int>(wlength * 2), 0, 0);
if (length <= 0)
return "asio.system error";
msg.resize(static_cast<std::size_t>(length));
return msg;
}
else
return "asio.system error";
}
#elif defined(ASIO_WINDOWS) || defined(__CYGWIN__)
char* msg = 0;
DWORD length = ::FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS, 0, value,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (char*)&msg, 0, 0);
detail::local_free_on_block_exit local_free_obj(msg);
if (length && msg[length - 1] == '\n')
msg[--length] = '\0';
if (length && msg[length - 1] == '\r')
msg[--length] = '\0';
if (length)
return msg;
else
return "asio.system error";
#else // defined(ASIO_WINDOWS_DESKTOP) || defined(__CYGWIN__)
#if !defined(__sun)
if (value == ECANCELED)
return "Operation aborted.";
#endif // !defined(__sun)
#if defined(__sun) || defined(__QNX__) || defined(__SYMBIAN32__)
using namespace std;
return strerror(value);
#else
char buf[256] = "";
using namespace std;
return strerror_result(strerror_r(value, buf, sizeof(buf)), buf);
#endif
#endif // defined(ASIO_WINDOWS_DESKTOP) || defined(__CYGWIN__)
}
#if defined(ASIO_HAS_STD_ERROR_CODE)
std::error_condition default_error_condition(
int ev) const ASIO_ERROR_CATEGORY_NOEXCEPT
{
switch (ev)
{
case access_denied:
return std::errc::permission_denied;
case address_family_not_supported:
return std::errc::address_family_not_supported;
case address_in_use:
return std::errc::address_in_use;
case already_connected:
return std::errc::already_connected;
case already_started:
return std::errc::connection_already_in_progress;
case broken_pipe:
return std::errc::broken_pipe;
case connection_aborted:
return std::errc::connection_aborted;
case connection_refused:
return std::errc::connection_refused;
case connection_reset:
return std::errc::connection_reset;
case bad_descriptor:
return std::errc::bad_file_descriptor;
case fault:
return std::errc::bad_address;
case host_unreachable:
return std::errc::host_unreachable;
case in_progress:
return std::errc::operation_in_progress;
case interrupted:
return std::errc::interrupted;
case invalid_argument:
return std::errc::invalid_argument;
case message_size:
return std::errc::message_size;
case name_too_long:
return std::errc::filename_too_long;
case network_down:
return std::errc::network_down;
case network_reset:
return std::errc::network_reset;
case network_unreachable:
return std::errc::network_unreachable;
case no_descriptors:
return std::errc::too_many_files_open;
case no_buffer_space:
return std::errc::no_buffer_space;
case no_memory:
return std::errc::not_enough_memory;
case no_permission:
return std::errc::operation_not_permitted;
case no_protocol_option:
return std::errc::no_protocol_option;
case no_such_device:
return std::errc::no_such_device;
case not_connected:
return std::errc::not_connected;
case not_socket:
return std::errc::not_a_socket;
case operation_aborted:
return std::errc::operation_canceled;
case operation_not_supported:
return std::errc::operation_not_supported;
case shut_down:
return std::make_error_condition(ev, *this);
case timed_out:
return std::errc::timed_out;
case try_again:
return std::errc::resource_unavailable_try_again;
case would_block:
return std::errc::operation_would_block;
default:
return std::make_error_condition(ev, *this);
}
#endif // defined(ASIO_HAS_STD_ERROR_CODE)
private:
// Helper function to adapt the result from glibc's variant of strerror_r.
static const char* strerror_result(int, const char* s) { return s; }
static const char* strerror_result(const char* s, const char*) { return s; }
};
} // namespace detail
const error_category& system_category()
{
static detail::system_category instance;
return instance;
}
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IMPL_ERROR_CODE_IPP