LCOV - code coverage report
Current view: top level - corosio/native/detail/epoll - epoll_tcp_acceptor_service.hpp (source / functions) Coverage Total Hit Missed
Test: coverage_remapped.info Lines: 69.4 % 111 77 34
Test Date: 2026-04-15 17:16:49 Functions: 100.0 % 12 12

           TLA  Line data    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                 : #ifndef BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
      11                 : #define BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
      12                 : 
      13                 : #include <boost/corosio/detail/platform.hpp>
      14                 : 
      15                 : #if BOOST_COROSIO_HAS_EPOLL
      16                 : 
      17                 : #include <boost/corosio/detail/config.hpp>
      18                 : #include <boost/capy/ex/execution_context.hpp>
      19                 : #include <boost/corosio/detail/tcp_acceptor_service.hpp>
      20                 : 
      21                 : #include <boost/corosio/native/detail/epoll/epoll_tcp_acceptor.hpp>
      22                 : #include <boost/corosio/native/detail/epoll/epoll_tcp_service.hpp>
      23                 : #include <boost/corosio/native/detail/epoll/epoll_scheduler.hpp>
      24                 : #include <boost/corosio/native/detail/reactor/reactor_acceptor_service.hpp>
      25                 : #include <boost/corosio/native/detail/reactor/reactor_op_complete.hpp>
      26                 : 
      27                 : #include <memory>
      28                 : #include <mutex>
      29                 : #include <utility>
      30                 : 
      31                 : #include <errno.h>
      32                 : #include <netinet/in.h>
      33                 : #include <sys/epoll.h>
      34                 : #include <sys/socket.h>
      35                 : #include <unistd.h>
      36                 : 
      37                 : namespace boost::corosio::detail {
      38                 : 
      39                 : /** epoll acceptor service implementation.
      40                 : 
      41                 :     Derives from reactor_acceptor_service for shared construct/
      42                 :     destroy/shutdown/close logic. Provides epoll-specific socket
      43                 :     creation (SOCK_NONBLOCK | SOCK_CLOEXEC) and dual-stack defaults.
      44                 :     Uses key_type = tcp_acceptor_service for service lookup.
      45                 : */
      46                 : class BOOST_COROSIO_DECL epoll_tcp_acceptor_service final
      47                 :     : public reactor_acceptor_service<
      48                 :           epoll_tcp_acceptor_service,
      49                 :           tcp_acceptor_service,
      50                 :           epoll_scheduler,
      51                 :           epoll_tcp_acceptor,
      52                 :           epoll_tcp_service>
      53                 : {
      54                 :     using base_type = reactor_acceptor_service<
      55                 :         epoll_tcp_acceptor_service,
      56                 :         tcp_acceptor_service,
      57                 :         epoll_scheduler,
      58                 :         epoll_tcp_acceptor,
      59                 :         epoll_tcp_service>;
      60                 :     friend base_type;
      61                 : 
      62                 : public:
      63                 :     explicit epoll_tcp_acceptor_service(capy::execution_context& ctx);
      64                 :     ~epoll_tcp_acceptor_service() override;
      65                 : 
      66                 :     std::error_code open_acceptor_socket(
      67                 :         tcp_acceptor::implementation& impl,
      68                 :         int family,
      69                 :         int type,
      70                 :         int protocol) override;
      71                 :     std::error_code
      72                 :     bind_acceptor(tcp_acceptor::implementation& impl, endpoint ep) override;
      73                 :     std::error_code
      74                 :     listen_acceptor(tcp_acceptor::implementation& impl, int backlog) override;
      75                 : };
      76                 : 
      77                 : inline void
      78 HIT           6 : epoll_accept_op::cancel() noexcept
      79                 : {
      80               6 :     if (acceptor_impl_)
      81               6 :         acceptor_impl_->cancel_single_op(*this);
      82                 :     else
      83 MIS           0 :         request_cancel();
      84 HIT           6 : }
      85                 : 
      86                 : inline void
      87            3404 : epoll_accept_op::operator()()
      88                 : {
      89            3404 :     complete_accept_op<epoll_tcp_socket>(*this);
      90            3404 : }
      91                 : 
      92              84 : inline epoll_tcp_acceptor::epoll_tcp_acceptor(
      93              84 :     epoll_tcp_acceptor_service& svc) noexcept
      94              84 :     : reactor_acceptor(svc)
      95                 : {
      96              84 : }
      97                 : 
      98                 : inline std::coroutine_handle<>
      99            3404 : epoll_tcp_acceptor::accept(
     100                 :     std::coroutine_handle<> h,
     101                 :     capy::executor_ref ex,
     102                 :     std::stop_token token,
     103                 :     std::error_code* ec,
     104                 :     io_object::implementation** impl_out)
     105                 : {
     106            3404 :     auto& op = acc_;
     107            3404 :     op.reset();
     108            3404 :     op.h        = h;
     109            3404 :     op.ex       = ex;
     110            3404 :     op.ec_out   = ec;
     111            3404 :     op.impl_out = impl_out;
     112            3404 :     op.fd       = fd_;
     113            3404 :     op.start(token, this);
     114                 : 
     115            3404 :     sockaddr_storage peer_storage{};
     116                 :     socklen_t addrlen;
     117                 :     int accepted;
     118                 :     do
     119                 :     {
     120            3404 :         addrlen = sizeof(peer_storage);
     121            3404 :         accepted = ::accept4(
     122                 :             fd_, reinterpret_cast<sockaddr*>(&peer_storage), &addrlen,
     123                 :             SOCK_NONBLOCK | SOCK_CLOEXEC);
     124                 :     }
     125            3404 :     while (accepted < 0 && errno == EINTR);
     126                 : 
     127            3404 :     if (accepted >= 0)
     128                 :     {
     129                 :         {
     130               3 :             std::lock_guard lock(desc_state_.mutex);
     131               3 :             desc_state_.read_ready = false;
     132               3 :         }
     133                 : 
     134               3 :         if (svc_.scheduler().try_consume_inline_budget())
     135                 :         {
     136 MIS           0 :             auto* socket_svc = svc_.stream_service();
     137               0 :             if (socket_svc)
     138                 :             {
     139                 :                 auto& impl =
     140               0 :                     static_cast<epoll_tcp_socket&>(*socket_svc->construct());
     141               0 :                 impl.set_socket(accepted);
     142                 : 
     143               0 :                 impl.desc_state_.fd = accepted;
     144                 :                 {
     145               0 :                     std::lock_guard lock(impl.desc_state_.mutex);
     146               0 :                     impl.desc_state_.read_op    = nullptr;
     147               0 :                     impl.desc_state_.write_op   = nullptr;
     148               0 :                     impl.desc_state_.connect_op = nullptr;
     149               0 :                 }
     150               0 :                 socket_svc->scheduler().register_descriptor(
     151                 :                     accepted, &impl.desc_state_);
     152                 : 
     153               0 :                 impl.set_endpoints(
     154                 :                     local_endpoint_, from_sockaddr(peer_storage));
     155                 : 
     156               0 :                 *ec = {};
     157               0 :                 if (impl_out)
     158               0 :                     *impl_out = &impl;
     159                 :             }
     160                 :             else
     161                 :             {
     162               0 :                 ::close(accepted);
     163               0 :                 *ec = make_err(ENOENT);
     164               0 :                 if (impl_out)
     165               0 :                     *impl_out = nullptr;
     166                 :             }
     167               0 :             op.cont_op.cont.h = h;
     168               0 :             return dispatch_coro(ex, op.cont_op.cont);
     169                 :         }
     170                 : 
     171 HIT           3 :         op.accepted_fd   = accepted;
     172               3 :         op.peer_storage  = peer_storage;
     173               3 :         op.peer_addrlen  = addrlen;
     174               3 :         op.complete(0, 0);
     175               3 :         op.impl_ptr = shared_from_this();
     176               3 :         svc_.post(&op);
     177               3 :         return std::noop_coroutine();
     178                 :     }
     179                 : 
     180            3401 :     if (errno == EAGAIN || errno == EWOULDBLOCK)
     181                 :     {
     182            3401 :         op.impl_ptr = shared_from_this();
     183            3401 :         svc_.work_started();
     184                 : 
     185            3401 :         std::lock_guard lock(desc_state_.mutex);
     186            3401 :         bool io_done = false;
     187            3401 :         if (desc_state_.read_ready)
     188                 :         {
     189 MIS           0 :             desc_state_.read_ready = false;
     190               0 :             op.perform_io();
     191               0 :             io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
     192               0 :             if (!io_done)
     193               0 :                 op.errn = 0;
     194                 :         }
     195                 : 
     196 HIT        3401 :         if (io_done || op.cancelled.load(std::memory_order_acquire))
     197                 :         {
     198 MIS           0 :             svc_.post(&op);
     199               0 :             svc_.work_finished();
     200                 :         }
     201                 :         else
     202                 :         {
     203 HIT        3401 :             desc_state_.read_op = &op;
     204                 :         }
     205            3401 :         return std::noop_coroutine();
     206            3401 :     }
     207                 : 
     208 MIS           0 :     op.complete(errno, 0);
     209               0 :     op.impl_ptr = shared_from_this();
     210               0 :     svc_.post(&op);
     211                 :     // completion is always posted to scheduler queue, never inline.
     212               0 :     return std::noop_coroutine();
     213                 : }
     214                 : 
     215                 : inline void
     216 HIT           2 : epoll_tcp_acceptor::cancel() noexcept
     217                 : {
     218               2 :     do_cancel();
     219               2 : }
     220                 : 
     221                 : inline void
     222             332 : epoll_tcp_acceptor::close_socket() noexcept
     223                 : {
     224             332 :     do_close_socket();
     225             332 : }
     226                 : 
     227             356 : inline epoll_tcp_acceptor_service::epoll_tcp_acceptor_service(
     228             356 :     capy::execution_context& ctx)
     229             356 :     : base_type(ctx)
     230                 : {
     231             356 :     auto* svc = ctx_.find_service<detail::tcp_service>();
     232             356 :     stream_svc_ = svc ? dynamic_cast<epoll_tcp_service*>(svc) : nullptr;
     233             356 : }
     234                 : 
     235             712 : inline epoll_tcp_acceptor_service::~epoll_tcp_acceptor_service() {}
     236                 : 
     237                 : inline std::error_code
     238              82 : epoll_tcp_acceptor_service::open_acceptor_socket(
     239                 :     tcp_acceptor::implementation& impl, int family, int type, int protocol)
     240                 : {
     241              82 :     auto* epoll_impl = static_cast<epoll_tcp_acceptor*>(&impl);
     242              82 :     epoll_impl->close_socket();
     243                 : 
     244              82 :     int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
     245              82 :     if (fd < 0)
     246 MIS           0 :         return make_err(errno);
     247                 : 
     248 HIT          82 :     if (family == AF_INET6)
     249                 :     {
     250               8 :         int val = 0; // dual-stack default
     251               8 :         ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
     252                 :     }
     253                 : 
     254              82 :     epoll_impl->fd_ = fd;
     255                 : 
     256                 :     // Set up descriptor state but do NOT register with epoll yet
     257              82 :     epoll_impl->desc_state_.fd = fd;
     258                 :     {
     259              82 :         std::lock_guard lock(epoll_impl->desc_state_.mutex);
     260              82 :         epoll_impl->desc_state_.read_op = nullptr;
     261              82 :     }
     262                 : 
     263              82 :     return {};
     264                 : }
     265                 : 
     266                 : inline std::error_code
     267              81 : epoll_tcp_acceptor_service::bind_acceptor(
     268                 :     tcp_acceptor::implementation& impl, endpoint ep)
     269                 : {
     270              81 :     return static_cast<epoll_tcp_acceptor*>(&impl)->do_bind(ep);
     271                 : }
     272                 : 
     273                 : inline std::error_code
     274              76 : epoll_tcp_acceptor_service::listen_acceptor(
     275                 :     tcp_acceptor::implementation& impl, int backlog)
     276                 : {
     277              76 :     return static_cast<epoll_tcp_acceptor*>(&impl)->do_listen(backlog);
     278                 : }
     279                 : 
     280                 : } // namespace boost::corosio::detail
     281                 : 
     282                 : #endif // BOOST_COROSIO_HAS_EPOLL
     283                 : 
     284                 : #endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
        

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