include/boost/corosio/detail/make_err.hpp

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1			//
2			// Copyright (c) 2025 Vinnie Falco ([email protected])
3			// Copyright (c) 2026 Steve Gerbino
4			//
5			// Distributed under the Boost Software License, Version 1.0. (See accompanying
6			// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7			//
8			// Official repository: https://github.com/cppalliance/corosio
9			//
10
11			#ifndef BOOST_COROSIO_DETAIL_MAKE_ERR_HPP
12			#define BOOST_COROSIO_DETAIL_MAKE_ERR_HPP
13
14			#include <boost/corosio/detail/config.hpp>
15			#include <boost/corosio/detail/platform.hpp>
16			#include <boost/capy/error.hpp>
17			#include <system_error>
18
19			#if BOOST_COROSIO_POSIX
20			#include <errno.h>
21			#else
22			#ifndef WIN32_LEAN_AND_MEAN
23			#define WIN32_LEAN_AND_MEAN
24			#endif
25			#include <Windows.h>
26			#endif
27
28			namespace boost::corosio::detail {
29
30			#if BOOST_COROSIO_POSIX
31
32			/** Convert a POSIX errno value to std::error_code.
33
34			Maps ECANCELED to capy::error::canceled.
35
36			@param errn The errno value.
37			@return The corresponding std::error_code.
38			*/
39			inline std::error_code
40			make_err(int errn) noexcept
41			{
42			if (errn == 0)
43			return {};
44
45			if (errn == ECANCELED)
46			return capy::error::canceled;
47
48			return std::error_code(errn, std::system_category());
49			}
50
51			#else
52
53			/** Convert a Windows error code to std::error_code.
54
55			Maps ERROR_OPERATION_ABORTED, ERROR_CANCELLED, and
56			ERROR_NETNAME_DELETED to capy::error::canceled.
57			Maps ERROR_HANDLE_EOF to capy::error::eof.
58
59			ERROR_NETNAME_DELETED (64) is what IOCP actually delivers
60			when closesocket() cancels pending overlapped I/O, despite
61			MSDN documenting ERROR_OPERATION_ABORTED for that case.
62
63			@param dwError The Windows error code (DWORD).
64			@return The corresponding std::error_code.
65			*/
66			inline std::error_code
67		16	make_err(unsigned long dwError) noexcept
68			{
69	1/2 ✗ Branch 2 → 3 not taken. ✓ Branch 2 → 4 taken 16 times.	16	if (dwError == 0)
70		✗	return {};
71
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73			dwError == ERROR_NETNAME_DELETED)
74		4	return capy::error::canceled;
75
76	1/2 ✗ Branch 8 → 9 not taken. ✓ Branch 8 → 10 taken 12 times.	12	if (dwError == ERROR_HANDLE_EOF)
77		✗	return capy::error::eof;
78
79		12	return std::error_code(static_cast<int>(dwError), std::system_category());
80			}
81
82			#endif
83
84			} // namespace boost::corosio::detail
85
86			#endif
87