include/boost/corosio/native/detail/iocp/win_dissociate.hpp
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|---|---|---|---|---|
| 1 | // | |||
| 2 | // Copyright (c) 2026 Steve Gerbino | |||
| 3 | // | |||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |||
| 6 | // | |||
| 7 | // Official repository: https://github.com/cppalliance/corosio | |||
| 8 | // | |||
| 9 | ||||
| 10 | #ifndef BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_DISSOCIATE_HPP | |||
| 11 | #define BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_DISSOCIATE_HPP | |||
| 12 | ||||
| 13 | #include <boost/corosio/detail/platform.hpp> | |||
| 14 | ||||
| 15 | #if BOOST_COROSIO_HAS_IOCP | |||
| 16 | ||||
| 17 | #include <boost/corosio/native/detail/iocp/win_windows.hpp> | |||
| 18 | ||||
| 19 | namespace boost::corosio::detail { | |||
| 20 | ||||
| 21 | /** Detach a socket from its I/O completion port. | |||
| 22 | ||||
| 23 | The documented API keeps a handle bound to its completion port for | |||
| 24 | the handle's lifetime; `NtSetInformationFile` with the | |||
| 25 | `FileReplaceCompletionInformation` class is the only way to sever | |||
| 26 | the association. Without this, a released socket can never be | |||
| 27 | adopted into an io_context again: re-association fails with | |||
| 28 | `ERROR_INVALID_PARAMETER`. | |||
| 29 | ||||
| 30 | @param s The socket to detach. | |||
| 31 | ||||
| 32 | @return `true` if the association was removed. | |||
| 33 | */ | |||
| 34 | inline bool | |||
| 35 | 13x | dissociate_from_iocp(SOCKET s) noexcept | ||
| 36 | { | |||
| 37 | using nt_set_information_file_fn = | |||
| 38 | LONG(NTAPI*)(HANDLE, ULONG_PTR*, void*, ULONG, ULONG); | |||
| 39 | ||||
| 40 | static nt_set_information_file_fn const fn = | |||
| 41 | 4x | []() noexcept -> nt_set_information_file_fn { | ||
| 42 |
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4x | if (HMODULE h = ::GetModuleHandleW(L"ntdll.dll")) | |
| 43 | { | |||
| 44 | // The two-step cast through void(*)() is the sanctioned | |||
| 45 | // FARPROC conversion; a direct cast trips | |||
| 46 | // -Wcast-function-type. | |||
| 47 | return reinterpret_cast<nt_set_information_file_fn>( | |||
| 48 | reinterpret_cast<void (*)()>( | |||
| 49 | 4x | ::GetProcAddress(h, "NtSetInformationFile"))); | ||
| 50 | } | |||
| 51 | ✗ | return nullptr; | ||
| 52 |
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13x | }(); | |
| 53 |
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13x | if (!fn) | |
| 54 | ✗ | return false; | ||
| 55 | ||||
| 56 | // FILE_COMPLETION_INFORMATION{ nullptr, nullptr } under info | |||
| 57 | // class FileReplaceCompletionInformation (61). | |||
| 58 | 13x | ULONG_PTR iosb[2] = {0, 0}; | ||
| 59 | 13x | void* info[2] = {nullptr, nullptr}; | ||
| 60 | 13x | return fn(reinterpret_cast<HANDLE>(s), iosb, &info, sizeof(info), 61) == | ||
| 61 | 13x | 0; | ||
| 62 | } | |||
| 63 | ||||
| 64 | } // namespace boost::corosio::detail | |||
| 65 | ||||
| 66 | #endif // BOOST_COROSIO_HAS_IOCP | |||
| 67 | ||||
| 68 | #endif // BOOST_COROSIO_NATIVE_DETAIL_IOCP_WIN_DISSOCIATE_HPP | |||
| 69 |