src/corosio/src/local_connect_pair.cpp
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64.9% Branches (37/57)
Functions (6)
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boost::corosio::(anonymous namespace)::pick_pair_path(std::filesystem::__cxx11::path&)
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boost::corosio::(anonymous namespace)::remove_pair_path(std::filesystem::__cxx11::path const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
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boost::corosio::(anonymous namespace)::make_pair_sockets(unsigned long long&, unsigned long long&)
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boost::corosio::(anonymous namespace)::make_pair_sockets(unsigned long long&, unsigned long long&)::{lambda()#1}::operator()() const
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boost::corosio::(anonymous namespace)::assign_pair(boost::corosio::local_stream_socket&, boost::corosio::local_stream_socket&, unsigned long long, unsigned long long)
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boost::corosio::connect_pair(boost::corosio::local_stream_socket&, boost::corosio::local_stream_socket&)
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| Line | Branch | TLA | Hits | Source Code |
|---|---|---|---|---|
| 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 | #include <boost/corosio/local_connect_pair.hpp> | |||
| 11 | #include <boost/corosio/detail/platform.hpp> | |||
| 12 | #include <boost/corosio/native/detail/make_err.hpp> | |||
| 13 | ||||
| 14 | #include <system_error> | |||
| 15 | ||||
| 16 | #if BOOST_COROSIO_POSIX | |||
| 17 | #include <fcntl.h> | |||
| 18 | #include <sys/socket.h> | |||
| 19 | #include <sys/un.h> | |||
| 20 | #include <unistd.h> | |||
| 21 | #elif BOOST_COROSIO_HAS_IOCP | |||
| 22 | #include <boost/corosio/native/detail/endpoint_convert.hpp> | |||
| 23 | ||||
| 24 | #include <algorithm> | |||
| 25 | #include <cstring> | |||
| 26 | #include <filesystem> | |||
| 27 | #include <random> | |||
| 28 | #include <string> | |||
| 29 | #include <thread> | |||
| 30 | ||||
| 31 | #ifndef WIN32_LEAN_AND_MEAN | |||
| 32 | #define WIN32_LEAN_AND_MEAN | |||
| 33 | #endif | |||
| 34 | #include <WinSock2.h> | |||
| 35 | ||||
| 36 | #ifndef AF_UNIX | |||
| 37 | #define AF_UNIX 1 | |||
| 38 | #endif | |||
| 39 | #endif | |||
| 40 | ||||
| 41 | namespace boost::corosio { | |||
| 42 | ||||
| 43 | namespace { | |||
| 44 | ||||
| 45 | #if BOOST_COROSIO_POSIX | |||
| 46 | ||||
| 47 | std::error_code | |||
| 48 | make_pair_fds(int type, int& a_fd, int& b_fd) noexcept | |||
| 49 | { | |||
| 50 | int fds[2]; | |||
| 51 | if (::socketpair(AF_UNIX, type, 0, fds) != 0) | |||
| 52 | return detail::make_err(errno); | |||
| 53 | ||||
| 54 | // assign() is documented "adopt-only" and will not mutate the fd; | |||
| 55 | // set O_NONBLOCK before transferring ownership. | |||
| 56 | for (int i = 0; i < 2; ++i) | |||
| 57 | { | |||
| 58 | int flags = ::fcntl(fds[i], F_GETFL, 0); | |||
| 59 | if (flags < 0 || ::fcntl(fds[i], F_SETFL, flags | O_NONBLOCK) < 0) | |||
| 60 | { | |||
| 61 | auto ec = detail::make_err(errno); | |||
| 62 | ::close(fds[0]); | |||
| 63 | ::close(fds[1]); | |||
| 64 | return ec; | |||
| 65 | } | |||
| 66 | } | |||
| 67 | ||||
| 68 | a_fd = fds[0]; | |||
| 69 | b_fd = fds[1]; | |||
| 70 | return {}; | |||
| 71 | } | |||
| 72 | ||||
| 73 | template<class Socket> | |||
| 74 | std::error_code | |||
| 75 | assign_pair(Socket& a, Socket& b, int a_fd, int b_fd) noexcept | |||
| 76 | { | |||
| 77 | if (auto ec = a.assign(a_fd)) | |||
| 78 | { | |||
| 79 | ::close(a_fd); | |||
| 80 | ::close(b_fd); | |||
| 81 | return ec; | |||
| 82 | } | |||
| 83 | ||||
| 84 | if (auto ec = b.assign(b_fd)) | |||
| 85 | { | |||
| 86 | a.close(); | |||
| 87 | ::close(b_fd); | |||
| 88 | return ec; | |||
| 89 | } | |||
| 90 | ||||
| 91 | return {}; | |||
| 92 | } | |||
| 93 | ||||
| 94 | #elif BOOST_COROSIO_HAS_IOCP | |||
| 95 | ||||
| 96 | // Build a unique sub-directory under temp and return the full socket | |||
| 97 | // path inside it. Empty string on failure. | |||
| 98 | std::string | |||
| 99 | 15x | pick_pair_path(std::filesystem::path& dir_out) | ||
| 100 | { | |||
| 101 | namespace fs = std::filesystem; | |||
| 102 | ||||
| 103 |
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15x | thread_local std::mt19937_64 gen{std::random_device{}()}; | |
| 104 | ||||
| 105 |
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15x | for (int attempt = 0; attempt < 16; ++attempt) | |
| 106 | { | |||
| 107 | auto candidate = | |||
| 108 |
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30x | fs::temp_directory_path() / | |
| 109 |
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45x | ("co_pair_" + std::to_string(gen())); | |
| 110 | 15x | std::error_code ec; | ||
| 111 |
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15x | if (fs::create_directory(candidate, ec)) | |
| 112 | { | |||
| 113 |
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15x | dir_out = candidate; | |
| 114 |
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15x | return (candidate / "s").string(); | |
| 115 | } | |||
| 116 | 15x | } | ||
| 117 | ✗ | return {}; | ||
| 118 | } | |||
| 119 | ||||
| 120 | void | |||
| 121 | 15x | remove_pair_path(std::filesystem::path const& dir, std::string const& path) | ||
| 122 | { | |||
| 123 | 15x | std::error_code ec; | ||
| 124 |
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15x | std::filesystem::remove(std::filesystem::path(path), ec); | |
| 125 | 15x | std::filesystem::remove(dir, ec); | ||
| 126 | 15x | } | ||
| 127 | ||||
| 128 | // Synchronously rendezvous two AF_UNIX SOCK_STREAM sockets. The | |||
| 129 | // listener and accept happen on the caller's thread; the connect | |||
| 130 | // runs on a short-lived worker to avoid a deadlock. The returned | |||
| 131 | // sockets are created with WSA_FLAG_OVERLAPPED so they can be | |||
| 132 | // registered with IOCP by assign_socket(). | |||
| 133 | std::error_code | |||
| 134 | 15x | make_pair_sockets(SOCKET& a_sock, SOCKET& b_sock) noexcept | ||
| 135 | { | |||
| 136 | namespace fs = std::filesystem; | |||
| 137 | ||||
| 138 | 15x | a_sock = INVALID_SOCKET; | ||
| 139 | 15x | b_sock = INVALID_SOCKET; | ||
| 140 | ||||
| 141 | 15x | fs::path dir; | ||
| 142 | 15x | std::string path = pick_pair_path(dir); | ||
| 143 |
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|
15x | if (path.empty()) | |
| 144 | ✗ | return detail::make_err(ERROR_PATH_NOT_FOUND); | ||
| 145 | ||||
| 146 | 15x | SOCKET listen_sock = ::WSASocketW( | ||
| 147 | AF_UNIX, SOCK_STREAM, 0, nullptr, 0, WSA_FLAG_OVERLAPPED); | |||
| 148 |
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|
15x | if (listen_sock == INVALID_SOCKET) | |
| 149 | { | |||
| 150 | ✗ | auto ec = detail::make_err(::WSAGetLastError()); | ||
| 151 | ✗ | remove_pair_path(dir, path); | ||
| 152 | ✗ | return ec; | ||
| 153 | } | |||
| 154 | ||||
| 155 | 15x | detail::un_sa_t addr{}; | ||
| 156 | 15x | addr.sun_family = AF_UNIX; | ||
| 157 | 30x | std::memcpy( | ||
| 158 | 15x | addr.sun_path, path.c_str(), | ||
| 159 | 15x | (std::min)(path.size(), sizeof(addr.sun_path) - 1)); | ||
| 160 | int addr_len = static_cast<int>( | |||
| 161 | 15x | offsetof(detail::un_sa_t, sun_path) + path.size() + 1); | ||
| 162 | ||||
| 163 | 15x | if (::bind( | ||
| 164 | listen_sock, reinterpret_cast<sockaddr*>(&addr), addr_len) | |||
| 165 |
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15x | == SOCKET_ERROR) | |
| 166 | { | |||
| 167 | ✗ | auto ec = detail::make_err(::WSAGetLastError()); | ||
| 168 | ✗ | ::closesocket(listen_sock); | ||
| 169 | ✗ | remove_pair_path(dir, path); | ||
| 170 | ✗ | return ec; | ||
| 171 | } | |||
| 172 | ||||
| 173 |
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15x | if (::listen(listen_sock, 1) == SOCKET_ERROR) | |
| 174 | { | |||
| 175 | ✗ | auto ec = detail::make_err(::WSAGetLastError()); | ||
| 176 | ✗ | ::closesocket(listen_sock); | ||
| 177 | ✗ | remove_pair_path(dir, path); | ||
| 178 | ✗ | return ec; | ||
| 179 | } | |||
| 180 | ||||
| 181 | 15x | SOCKET worker_sock = INVALID_SOCKET; | ||
| 182 | 15x | std::error_code worker_ec; | ||
| 183 | ||||
| 184 | 45x | std::thread worker([&] { | ||
| 185 |
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15x | worker_sock = ::WSASocketW( | |
| 186 | AF_UNIX, SOCK_STREAM, 0, nullptr, 0, WSA_FLAG_OVERLAPPED); | |||
| 187 |
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15x | if (worker_sock == INVALID_SOCKET) | |
| 188 | { | |||
| 189 | ✗ | worker_ec = detail::make_err(::WSAGetLastError()); | ||
| 190 | ✗ | return; | ||
| 191 | } | |||
| 192 | ||||
| 193 | 15x | detail::un_sa_t caddr{}; | ||
| 194 | 15x | caddr.sun_family = AF_UNIX; | ||
| 195 | 30x | std::memcpy( | ||
| 196 | 15x | caddr.sun_path, path.c_str(), | ||
| 197 | 15x | (std::min)(path.size(), sizeof(caddr.sun_path) - 1)); | ||
| 198 | int caddr_len = static_cast<int>( | |||
| 199 | 15x | offsetof(detail::un_sa_t, sun_path) + path.size() + 1); | ||
| 200 | ||||
| 201 |
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15x | if (::connect( | |
| 202 | worker_sock, reinterpret_cast<sockaddr*>(&caddr), caddr_len) | |||
| 203 |
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15x | == SOCKET_ERROR) | |
| 204 | { | |||
| 205 | ✗ | worker_ec = detail::make_err(::WSAGetLastError()); | ||
| 206 | ✗ | ::closesocket(worker_sock); | ||
| 207 | ✗ | worker_sock = INVALID_SOCKET; | ||
| 208 | } | |||
| 209 | 15x | }); | ||
| 210 | ||||
| 211 | 15x | SOCKET accept_sock = ::accept(listen_sock, nullptr, nullptr); | ||
| 212 | 15x | std::error_code accept_ec; | ||
| 213 |
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15x | if (accept_sock == INVALID_SOCKET) | |
| 214 | ✗ | accept_ec = detail::make_err(::WSAGetLastError()); | ||
| 215 | ||||
| 216 | 15x | worker.join(); | ||
| 217 | ||||
| 218 | 15x | ::closesocket(listen_sock); | ||
| 219 | 15x | remove_pair_path(dir, path); | ||
| 220 | ||||
| 221 |
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15x | if (accept_ec) | |
| 222 | { | |||
| 223 | ✗ | if (worker_sock != INVALID_SOCKET) | ||
| 224 | ✗ | ::closesocket(worker_sock); | ||
| 225 | ✗ | return accept_ec; | ||
| 226 | } | |||
| 227 |
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15x | if (worker_ec) | |
| 228 | { | |||
| 229 | ✗ | ::closesocket(accept_sock); | ||
| 230 | ✗ | return worker_ec; | ||
| 231 | } | |||
| 232 | ||||
| 233 | 15x | a_sock = accept_sock; | ||
| 234 | 15x | b_sock = worker_sock; | ||
| 235 | 15x | return {}; | ||
| 236 | 15x | } | ||
| 237 | ||||
| 238 | std::error_code | |||
| 239 | 15x | assign_pair( | ||
| 240 | local_stream_socket& a, | |||
| 241 | local_stream_socket& b, | |||
| 242 | SOCKET a_sock, | |||
| 243 | SOCKET b_sock) noexcept | |||
| 244 | { | |||
| 245 |
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15x | if (auto ec = a.assign(static_cast<native_handle_type>(a_sock))) | |
| 246 | { | |||
| 247 | ✗ | ::closesocket(a_sock); | ||
| 248 | ✗ | ::closesocket(b_sock); | ||
| 249 | ✗ | return ec; | ||
| 250 | } | |||
| 251 | ||||
| 252 |
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15x | if (auto ec = b.assign(static_cast<native_handle_type>(b_sock))) | |
| 253 | { | |||
| 254 | ✗ | a.close(); | ||
| 255 | ✗ | ::closesocket(b_sock); | ||
| 256 | ✗ | return ec; | ||
| 257 | } | |||
| 258 | ||||
| 259 | 15x | return {}; | ||
| 260 | } | |||
| 261 | ||||
| 262 | #endif | |||
| 263 | ||||
| 264 | } // namespace | |||
| 265 | ||||
| 266 | std::error_code | |||
| 267 | 16x | connect_pair(local_stream_socket& a, local_stream_socket& b) noexcept | ||
| 268 | { | |||
| 269 |
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16x | if (a.is_open() || b.is_open()) | |
| 270 | 1x | return std::make_error_code(std::errc::already_connected); | ||
| 271 | ||||
| 272 | #if BOOST_COROSIO_POSIX | |||
| 273 | int a_fd = -1, b_fd = -1; | |||
| 274 | if (auto ec = make_pair_fds(SOCK_STREAM, a_fd, b_fd)) | |||
| 275 | return ec; | |||
| 276 | return assign_pair(a, b, a_fd, b_fd); | |||
| 277 | #elif BOOST_COROSIO_HAS_IOCP | |||
| 278 | 15x | SOCKET a_sock = INVALID_SOCKET, b_sock = INVALID_SOCKET; | ||
| 279 |
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15x | if (auto ec = make_pair_sockets(a_sock, b_sock)) | |
| 280 | ✗ | return ec; | ||
| 281 | 15x | return assign_pair(a, b, a_sock, b_sock); | ||
| 282 | #else | |||
| 283 | return detail::make_err(ENOSYS); | |||
| 284 | #endif | |||
| 285 | } | |||
| 286 | ||||
| 287 | #if BOOST_COROSIO_POSIX | |||
| 288 | ||||
| 289 | std::error_code | |||
| 290 | connect_pair(local_datagram_socket& a, local_datagram_socket& b) noexcept | |||
| 291 | { | |||
| 292 | if (a.is_open() || b.is_open()) | |||
| 293 | return std::make_error_code(std::errc::already_connected); | |||
| 294 | ||||
| 295 | int a_fd = -1, b_fd = -1; | |||
| 296 | if (auto ec = make_pair_fds(SOCK_DGRAM, a_fd, b_fd)) | |||
| 297 | return ec; | |||
| 298 | return assign_pair(a, b, a_fd, b_fd); | |||
| 299 | } | |||
| 300 | ||||
| 301 | #endif | |||
| 302 | ||||
| 303 | } // namespace boost::corosio | |||
| 304 |