libs/corosio/src/corosio/src/detail/select/acceptors.cpp
64.3% Lines (160/249)
88.9% Functions (16/18)
45.5% Branches (66/145)
libs/corosio/src/corosio/src/detail/select/acceptors.cpp
| Line | Branch | 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/detail/platform.hpp> | ||
| 11 | |||
| 12 | #if BOOST_COROSIO_HAS_SELECT | ||
| 13 | |||
| 14 | #include "src/detail/select/acceptors.hpp" | ||
| 15 | #include "src/detail/select/sockets.hpp" | ||
| 16 | #include "src/detail/endpoint_convert.hpp" | ||
| 17 | #include "src/detail/make_err.hpp" | ||
| 18 | |||
| 19 | #include <errno.h> | ||
| 20 | #include <fcntl.h> | ||
| 21 | #include <netinet/in.h> | ||
| 22 | #include <sys/socket.h> | ||
| 23 | #include <unistd.h> | ||
| 24 | |||
| 25 | namespace boost::corosio::detail { | ||
| 26 | |||
| 27 | void | ||
| 28 | ✗ | select_accept_op:: | |
| 29 | cancel() noexcept | ||
| 30 | { | ||
| 31 | ✗ | if (acceptor_impl_) | |
| 32 | ✗ | acceptor_impl_->cancel_single_op(*this); | |
| 33 | else | ||
| 34 | ✗ | request_cancel(); | |
| 35 | ✗ | } | |
| 36 | |||
| 37 | void | ||
| 38 | 3837 | select_accept_op:: | |
| 39 | operator()() | ||
| 40 | { | ||
| 41 | 3837 | stop_cb.reset(); | |
| 42 | |||
| 43 |
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3837 | bool success = (errn == 0 && !cancelled.load(std::memory_order_acquire)); |
| 44 | |||
| 45 |
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3837 | if (ec_out) |
| 46 | { | ||
| 47 |
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3837 | if (cancelled.load(std::memory_order_acquire)) |
| 48 | 3 | *ec_out = capy::error::canceled; | |
| 49 |
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3834 | else if (errn != 0) |
| 50 | ✗ | *ec_out = make_err(errn); | |
| 51 | else | ||
| 52 | 3834 | *ec_out = {}; | |
| 53 | } | ||
| 54 | |||
| 55 |
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3837 | if (success && accepted_fd >= 0) |
| 56 | { | ||
| 57 |
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3834 | if (acceptor_impl_) |
| 58 | { | ||
| 59 | 3834 | auto* socket_svc = static_cast<select_acceptor_impl*>(acceptor_impl_) | |
| 60 | 3834 | ->service().socket_service(); | |
| 61 |
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3834 | if (socket_svc) |
| 62 | { | ||
| 63 |
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3834 | auto& impl = static_cast<select_socket_impl&>(socket_svc->create_impl()); |
| 64 | 3834 | impl.set_socket(accepted_fd); | |
| 65 | |||
| 66 | 3834 | sockaddr_in local_addr{}; | |
| 67 | 3834 | socklen_t local_len = sizeof(local_addr); | |
| 68 | 3834 | sockaddr_in remote_addr{}; | |
| 69 | 3834 | socklen_t remote_len = sizeof(remote_addr); | |
| 70 | |||
| 71 | 3834 | endpoint local_ep, remote_ep; | |
| 72 |
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3834 | if (::getsockname(accepted_fd, reinterpret_cast<sockaddr*>(&local_addr), &local_len) == 0) |
| 73 | 3834 | local_ep = from_sockaddr_in(local_addr); | |
| 74 |
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3834 | if (::getpeername(accepted_fd, reinterpret_cast<sockaddr*>(&remote_addr), &remote_len) == 0) |
| 75 | 3834 | remote_ep = from_sockaddr_in(remote_addr); | |
| 76 | |||
| 77 | 3834 | impl.set_endpoints(local_ep, remote_ep); | |
| 78 | |||
| 79 |
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3834 | if (impl_out) |
| 80 | 3834 | *impl_out = &impl; | |
| 81 | |||
| 82 | 3834 | accepted_fd = -1; | |
| 83 | } | ||
| 84 | else | ||
| 85 | { | ||
| 86 | ✗ | if (ec_out && !*ec_out) | |
| 87 | ✗ | *ec_out = make_err(ENOENT); | |
| 88 | ✗ | ::close(accepted_fd); | |
| 89 | ✗ | accepted_fd = -1; | |
| 90 | ✗ | if (impl_out) | |
| 91 | ✗ | *impl_out = nullptr; | |
| 92 | } | ||
| 93 | } | ||
| 94 | else | ||
| 95 | { | ||
| 96 | ✗ | ::close(accepted_fd); | |
| 97 | ✗ | accepted_fd = -1; | |
| 98 | ✗ | if (impl_out) | |
| 99 | ✗ | *impl_out = nullptr; | |
| 100 | } | ||
| 101 | 3834 | } | |
| 102 | else | ||
| 103 | { | ||
| 104 |
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3 | if (accepted_fd >= 0) |
| 105 | { | ||
| 106 | ✗ | ::close(accepted_fd); | |
| 107 | ✗ | accepted_fd = -1; | |
| 108 | } | ||
| 109 | |||
| 110 |
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3 | if (peer_impl) |
| 111 | { | ||
| 112 | ✗ | peer_impl->release(); | |
| 113 | ✗ | peer_impl = nullptr; | |
| 114 | } | ||
| 115 | |||
| 116 |
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3 | if (impl_out) |
| 117 | 3 | *impl_out = nullptr; | |
| 118 | } | ||
| 119 | |||
| 120 | // Move to stack before destroying the frame | ||
| 121 | 3837 | capy::executor_ref saved_ex( std::move( ex ) ); | |
| 122 | 3837 | capy::coro saved_h( std::move( h ) ); | |
| 123 | 3837 | impl_ptr.reset(); | |
| 124 |
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3837 | saved_ex.dispatch( saved_h ); |
| 125 | 3837 | } | |
| 126 | |||
| 127 | 54 | select_acceptor_impl:: | |
| 128 | 54 | select_acceptor_impl(select_acceptor_service& svc) noexcept | |
| 129 | 54 | : svc_(svc) | |
| 130 | { | ||
| 131 | 54 | } | |
| 132 | |||
| 133 | void | ||
| 134 | 54 | select_acceptor_impl:: | |
| 135 | release() | ||
| 136 | { | ||
| 137 | 54 | close_socket(); | |
| 138 | 54 | svc_.destroy_acceptor_impl(*this); | |
| 139 | 54 | } | |
| 140 | |||
| 141 | std::coroutine_handle<> | ||
| 142 | 3837 | select_acceptor_impl:: | |
| 143 | accept( | ||
| 144 | std::coroutine_handle<> h, | ||
| 145 | capy::executor_ref ex, | ||
| 146 | std::stop_token token, | ||
| 147 | std::error_code* ec, | ||
| 148 | io_object::io_object_impl** impl_out) | ||
| 149 | { | ||
| 150 | 3837 | auto& op = acc_; | |
| 151 | 3837 | op.reset(); | |
| 152 | 3837 | op.h = h; | |
| 153 | 3837 | op.ex = ex; | |
| 154 | 3837 | op.ec_out = ec; | |
| 155 | 3837 | op.impl_out = impl_out; | |
| 156 | 3837 | op.fd = fd_; | |
| 157 | 3837 | op.start(token, this); | |
| 158 | |||
| 159 | 3837 | sockaddr_in addr{}; | |
| 160 | 3837 | socklen_t addrlen = sizeof(addr); | |
| 161 |
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3837 | int accepted = ::accept(fd_, reinterpret_cast<sockaddr*>(&addr), &addrlen); |
| 162 | |||
| 163 |
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3837 | if (accepted >= 0) |
| 164 | { | ||
| 165 | // Reject fds that exceed select()'s FD_SETSIZE limit. | ||
| 166 | // Better to fail now than during later async operations. | ||
| 167 |
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2 | if (accepted >= FD_SETSIZE) |
| 168 | { | ||
| 169 | ✗ | ::close(accepted); | |
| 170 | ✗ | op.accepted_fd = -1; | |
| 171 | ✗ | op.complete(EINVAL, 0); | |
| 172 | ✗ | op.impl_ptr = shared_from_this(); | |
| 173 | ✗ | svc_.post(&op); | |
| 174 | // completion is always posted to scheduler queue, never inline. | ||
| 175 | ✗ | return std::noop_coroutine(); | |
| 176 | } | ||
| 177 | |||
| 178 | // Set non-blocking and close-on-exec flags. | ||
| 179 | // A non-blocking socket is essential for the async reactor; | ||
| 180 | // if we can't configure it, fail rather than risk blocking. | ||
| 181 |
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2 | int flags = ::fcntl(accepted, F_GETFL, 0); |
| 182 |
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2 | if (flags == -1) |
| 183 | { | ||
| 184 | ✗ | int err = errno; | |
| 185 | ✗ | ::close(accepted); | |
| 186 | ✗ | op.accepted_fd = -1; | |
| 187 | ✗ | op.complete(err, 0); | |
| 188 | ✗ | op.impl_ptr = shared_from_this(); | |
| 189 | ✗ | svc_.post(&op); | |
| 190 | // completion is always posted to scheduler queue, never inline. | ||
| 191 | ✗ | return std::noop_coroutine(); | |
| 192 | } | ||
| 193 | |||
| 194 |
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2 | if (::fcntl(accepted, F_SETFL, flags | O_NONBLOCK) == -1) |
| 195 | { | ||
| 196 | ✗ | int err = errno; | |
| 197 | ✗ | ::close(accepted); | |
| 198 | ✗ | op.accepted_fd = -1; | |
| 199 | ✗ | op.complete(err, 0); | |
| 200 | ✗ | op.impl_ptr = shared_from_this(); | |
| 201 | ✗ | svc_.post(&op); | |
| 202 | // completion is always posted to scheduler queue, never inline. | ||
| 203 | ✗ | return std::noop_coroutine(); | |
| 204 | } | ||
| 205 | |||
| 206 |
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2 | if (::fcntl(accepted, F_SETFD, FD_CLOEXEC) == -1) |
| 207 | { | ||
| 208 | ✗ | int err = errno; | |
| 209 | ✗ | ::close(accepted); | |
| 210 | ✗ | op.accepted_fd = -1; | |
| 211 | ✗ | op.complete(err, 0); | |
| 212 | ✗ | op.impl_ptr = shared_from_this(); | |
| 213 | ✗ | svc_.post(&op); | |
| 214 | // completion is always posted to scheduler queue, never inline. | ||
| 215 | ✗ | return std::noop_coroutine(); | |
| 216 | } | ||
| 217 | |||
| 218 | 2 | op.accepted_fd = accepted; | |
| 219 | 2 | op.complete(0, 0); | |
| 220 |
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2 | op.impl_ptr = shared_from_this(); |
| 221 |
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2 | svc_.post(&op); |
| 222 | // completion is always posted to scheduler queue, never inline. | ||
| 223 | 2 | return std::noop_coroutine(); | |
| 224 | } | ||
| 225 | |||
| 226 |
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3835 | if (errno == EAGAIN || errno == EWOULDBLOCK) |
| 227 | { | ||
| 228 | 3835 | svc_.work_started(); | |
| 229 |
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3835 | op.impl_ptr = shared_from_this(); |
| 230 | |||
| 231 | // Set registering BEFORE register_fd to close the race window where | ||
| 232 | // reactor sees an event before we set registered. | ||
| 233 | 3835 | op.registered.store(select_registration_state::registering, std::memory_order_release); | |
| 234 |
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3835 | svc_.scheduler().register_fd(fd_, &op, select_scheduler::event_read); |
| 235 | |||
| 236 | // Transition to registered. If this fails, reactor or cancel already | ||
| 237 | // claimed the op (state is now unregistered), so we're done. However, | ||
| 238 | // we must still deregister the fd because cancel's deregister_fd may | ||
| 239 | // have run before our register_fd, leaving the fd orphaned. | ||
| 240 | 3835 | auto expected = select_registration_state::registering; | |
| 241 |
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3835 | if (!op.registered.compare_exchange_strong( |
| 242 | expected, select_registration_state::registered, std::memory_order_acq_rel)) | ||
| 243 | { | ||
| 244 | ✗ | svc_.scheduler().deregister_fd(fd_, select_scheduler::event_read); | |
| 245 | // completion is always posted to scheduler queue, never inline. | ||
| 246 | ✗ | return std::noop_coroutine(); | |
| 247 | } | ||
| 248 | |||
| 249 | // If cancelled was set before we registered, handle it now. | ||
| 250 |
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3835 | if (op.cancelled.load(std::memory_order_acquire)) |
| 251 | { | ||
| 252 | ✗ | auto prev = op.registered.exchange( | |
| 253 | select_registration_state::unregistered, std::memory_order_acq_rel); | ||
| 254 | ✗ | if (prev != select_registration_state::unregistered) | |
| 255 | { | ||
| 256 | ✗ | svc_.scheduler().deregister_fd(fd_, select_scheduler::event_read); | |
| 257 | ✗ | op.impl_ptr = shared_from_this(); | |
| 258 | ✗ | svc_.post(&op); | |
| 259 | ✗ | svc_.work_finished(); | |
| 260 | } | ||
| 261 | } | ||
| 262 | // completion is always posted to scheduler queue, never inline. | ||
| 263 | 3835 | return std::noop_coroutine(); | |
| 264 | } | ||
| 265 | |||
| 266 | ✗ | op.complete(errno, 0); | |
| 267 | ✗ | op.impl_ptr = shared_from_this(); | |
| 268 | ✗ | svc_.post(&op); | |
| 269 | // completion is always posted to scheduler queue, never inline. | ||
| 270 | ✗ | return std::noop_coroutine(); | |
| 271 | } | ||
| 272 | |||
| 273 | void | ||
| 274 | 109 | select_acceptor_impl:: | |
| 275 | cancel() noexcept | ||
| 276 | { | ||
| 277 | 109 | std::shared_ptr<select_acceptor_impl> self; | |
| 278 | try { | ||
| 279 |
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109 | self = shared_from_this(); |
| 280 | ✗ | } catch (const std::bad_weak_ptr&) { | |
| 281 | ✗ | return; | |
| 282 | ✗ | } | |
| 283 | |||
| 284 | 109 | auto prev = acc_.registered.exchange( | |
| 285 | select_registration_state::unregistered, std::memory_order_acq_rel); | ||
| 286 | 109 | acc_.request_cancel(); | |
| 287 | |||
| 288 |
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109 | if (prev != select_registration_state::unregistered) |
| 289 | { | ||
| 290 | 3 | svc_.scheduler().deregister_fd(fd_, select_scheduler::event_read); | |
| 291 | 3 | acc_.impl_ptr = self; | |
| 292 | 3 | svc_.post(&acc_); | |
| 293 | 3 | svc_.work_finished(); | |
| 294 | } | ||
| 295 | 109 | } | |
| 296 | |||
| 297 | void | ||
| 298 | ✗ | select_acceptor_impl:: | |
| 299 | cancel_single_op(select_op& op) noexcept | ||
| 300 | { | ||
| 301 | // Called from stop_token callback to cancel a specific pending operation. | ||
| 302 | ✗ | auto prev = op.registered.exchange( | |
| 303 | select_registration_state::unregistered, std::memory_order_acq_rel); | ||
| 304 | ✗ | op.request_cancel(); | |
| 305 | |||
| 306 | ✗ | if (prev != select_registration_state::unregistered) | |
| 307 | { | ||
| 308 | ✗ | svc_.scheduler().deregister_fd(fd_, select_scheduler::event_read); | |
| 309 | |||
| 310 | // Keep impl alive until op completes | ||
| 311 | try { | ||
| 312 | ✗ | op.impl_ptr = shared_from_this(); | |
| 313 | ✗ | } catch (const std::bad_weak_ptr&) { | |
| 314 | // Impl is being destroyed, op will be orphaned but that's ok | ||
| 315 | ✗ | } | |
| 316 | |||
| 317 | ✗ | svc_.post(&op); | |
| 318 | ✗ | svc_.work_finished(); | |
| 319 | } | ||
| 320 | ✗ | } | |
| 321 | |||
| 322 | void | ||
| 323 | 108 | select_acceptor_impl:: | |
| 324 | close_socket() noexcept | ||
| 325 | { | ||
| 326 | 108 | cancel(); | |
| 327 | |||
| 328 |
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108 | if (fd_ >= 0) |
| 329 | { | ||
| 330 | // Unconditionally remove from registered_fds_ to handle edge cases | ||
| 331 | 42 | svc_.scheduler().deregister_fd(fd_, select_scheduler::event_read); | |
| 332 | 42 | ::close(fd_); | |
| 333 | 42 | fd_ = -1; | |
| 334 | } | ||
| 335 | |||
| 336 | // Clear cached endpoint | ||
| 337 | 108 | local_endpoint_ = endpoint{}; | |
| 338 | 108 | } | |
| 339 | |||
| 340 | 120 | select_acceptor_service:: | |
| 341 | 120 | select_acceptor_service(capy::execution_context& ctx) | |
| 342 | 120 | : ctx_(ctx) | |
| 343 |
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120 | , state_(std::make_unique<select_acceptor_state>(ctx.use_service<select_scheduler>())) |
| 344 | { | ||
| 345 | 120 | } | |
| 346 | |||
| 347 | 240 | select_acceptor_service:: | |
| 348 | 120 | ~select_acceptor_service() | |
| 349 | { | ||
| 350 | 240 | } | |
| 351 | |||
| 352 | void | ||
| 353 | 120 | select_acceptor_service:: | |
| 354 | shutdown() | ||
| 355 | { | ||
| 356 |
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120 | std::lock_guard lock(state_->mutex_); |
| 357 | |||
| 358 |
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120 | while (auto* impl = state_->acceptor_list_.pop_front()) |
| 359 | ✗ | impl->close_socket(); | |
| 360 | |||
| 361 | 120 | state_->acceptor_ptrs_.clear(); | |
| 362 | 120 | } | |
| 363 | |||
| 364 | tcp_acceptor::acceptor_impl& | ||
| 365 | 54 | select_acceptor_service:: | |
| 366 | create_acceptor_impl() | ||
| 367 | { | ||
| 368 |
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54 | auto impl = std::make_shared<select_acceptor_impl>(*this); |
| 369 | 54 | auto* raw = impl.get(); | |
| 370 | |||
| 371 |
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54 | std::lock_guard lock(state_->mutex_); |
| 372 | 54 | state_->acceptor_list_.push_back(raw); | |
| 373 |
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54 | state_->acceptor_ptrs_.emplace(raw, std::move(impl)); |
| 374 | |||
| 375 | 54 | return *raw; | |
| 376 | 54 | } | |
| 377 | |||
| 378 | void | ||
| 379 | 54 | select_acceptor_service:: | |
| 380 | destroy_acceptor_impl(tcp_acceptor::acceptor_impl& impl) | ||
| 381 | { | ||
| 382 | 54 | auto* select_impl = static_cast<select_acceptor_impl*>(&impl); | |
| 383 |
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54 | std::lock_guard lock(state_->mutex_); |
| 384 | 54 | state_->acceptor_list_.remove(select_impl); | |
| 385 |
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54 | state_->acceptor_ptrs_.erase(select_impl); |
| 386 | 54 | } | |
| 387 | |||
| 388 | std::error_code | ||
| 389 | 54 | select_acceptor_service:: | |
| 390 | open_acceptor( | ||
| 391 | tcp_acceptor::acceptor_impl& impl, | ||
| 392 | endpoint ep, | ||
| 393 | int backlog) | ||
| 394 | { | ||
| 395 | 54 | auto* select_impl = static_cast<select_acceptor_impl*>(&impl); | |
| 396 | 54 | select_impl->close_socket(); | |
| 397 | |||
| 398 | 54 | int fd = ::socket(AF_INET, SOCK_STREAM, 0); | |
| 399 |
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54 | if (fd < 0) |
| 400 | ✗ | return make_err(errno); | |
| 401 | |||
| 402 | // Set non-blocking and close-on-exec | ||
| 403 |
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54 | int flags = ::fcntl(fd, F_GETFL, 0); |
| 404 |
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54 | if (flags == -1) |
| 405 | { | ||
| 406 | ✗ | int errn = errno; | |
| 407 | ✗ | ::close(fd); | |
| 408 | ✗ | return make_err(errn); | |
| 409 | } | ||
| 410 |
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54 | if (::fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) |
| 411 | { | ||
| 412 | ✗ | int errn = errno; | |
| 413 | ✗ | ::close(fd); | |
| 414 | ✗ | return make_err(errn); | |
| 415 | } | ||
| 416 |
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54 | if (::fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) |
| 417 | { | ||
| 418 | ✗ | int errn = errno; | |
| 419 | ✗ | ::close(fd); | |
| 420 | ✗ | return make_err(errn); | |
| 421 | } | ||
| 422 | |||
| 423 | // Check fd is within select() limits | ||
| 424 |
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54 | if (fd >= FD_SETSIZE) |
| 425 | { | ||
| 426 | ✗ | ::close(fd); | |
| 427 | ✗ | return make_err(EMFILE); | |
| 428 | } | ||
| 429 | |||
| 430 | 54 | int reuse = 1; | |
| 431 | 54 | ::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)); | |
| 432 | |||
| 433 | 54 | sockaddr_in addr = detail::to_sockaddr_in(ep); | |
| 434 |
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54 | if (::bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) |
| 435 | { | ||
| 436 | 12 | int errn = errno; | |
| 437 |
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12 | ::close(fd); |
| 438 | 12 | return make_err(errn); | |
| 439 | } | ||
| 440 | |||
| 441 |
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42 | if (::listen(fd, backlog) < 0) |
| 442 | { | ||
| 443 | ✗ | int errn = errno; | |
| 444 | ✗ | ::close(fd); | |
| 445 | ✗ | return make_err(errn); | |
| 446 | } | ||
| 447 | |||
| 448 | 42 | select_impl->fd_ = fd; | |
| 449 | |||
| 450 | // Cache the local endpoint (queries OS for ephemeral port if port was 0) | ||
| 451 | 42 | sockaddr_in local_addr{}; | |
| 452 | 42 | socklen_t local_len = sizeof(local_addr); | |
| 453 |
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42 | if (::getsockname(fd, reinterpret_cast<sockaddr*>(&local_addr), &local_len) == 0) |
| 454 | 42 | select_impl->set_local_endpoint(detail::from_sockaddr_in(local_addr)); | |
| 455 | |||
| 456 | 42 | return {}; | |
| 457 | } | ||
| 458 | |||
| 459 | void | ||
| 460 | 5 | select_acceptor_service:: | |
| 461 | post(select_op* op) | ||
| 462 | { | ||
| 463 | 5 | state_->sched_.post(op); | |
| 464 | 5 | } | |
| 465 | |||
| 466 | void | ||
| 467 | 3835 | select_acceptor_service:: | |
| 468 | work_started() noexcept | ||
| 469 | { | ||
| 470 | 3835 | state_->sched_.work_started(); | |
| 471 | 3835 | } | |
| 472 | |||
| 473 | void | ||
| 474 | 3 | select_acceptor_service:: | |
| 475 | work_finished() noexcept | ||
| 476 | { | ||
| 477 | 3 | state_->sched_.work_finished(); | |
| 478 | 3 | } | |
| 479 | |||
| 480 | select_socket_service* | ||
| 481 | 3834 | select_acceptor_service:: | |
| 482 | socket_service() const noexcept | ||
| 483 | { | ||
| 484 | 3834 | auto* svc = ctx_.find_service<detail::socket_service>(); | |
| 485 |
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3834 | return svc ? dynamic_cast<select_socket_service*>(svc) : nullptr; |
| 486 | } | ||
| 487 | |||
| 488 | } // namespace boost::corosio::detail | ||
| 489 | |||
| 490 | #endif // BOOST_COROSIO_HAS_SELECT | ||
| 491 |