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: 69.1 % 110 76 34
Test Date: 2026-04-13 22:45:57 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            4825 : epoll_accept_op::operator()()
      88                 : {
      89            4825 :     complete_accept_op<epoll_tcp_socket>(*this);
      90            4825 : }
      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            4825 : 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            4825 :     auto& op = acc_;
     107            4825 :     op.reset();
     108            4825 :     op.h        = h;
     109            4825 :     op.ex       = ex;
     110            4825 :     op.ec_out   = ec;
     111            4825 :     op.impl_out = impl_out;
     112            4825 :     op.fd       = fd_;
     113            4825 :     op.start(token, this);
     114                 : 
     115            4825 :     sockaddr_storage peer_storage{};
     116            4825 :     socklen_t addrlen = sizeof(peer_storage);
     117                 :     int accepted;
     118                 :     do
     119                 :     {
     120            4825 :         accepted = ::accept4(
     121                 :             fd_, reinterpret_cast<sockaddr*>(&peer_storage), &addrlen,
     122                 :             SOCK_NONBLOCK | SOCK_CLOEXEC);
     123                 :     }
     124            4825 :     while (accepted < 0 && errno == EINTR);
     125                 : 
     126            4825 :     if (accepted >= 0)
     127                 :     {
     128                 :         {
     129               3 :             std::lock_guard lock(desc_state_.mutex);
     130               3 :             desc_state_.read_ready = false;
     131               3 :         }
     132                 : 
     133               3 :         if (svc_.scheduler().try_consume_inline_budget())
     134                 :         {
     135 MIS           0 :             auto* socket_svc = svc_.stream_service();
     136               0 :             if (socket_svc)
     137                 :             {
     138                 :                 auto& impl =
     139               0 :                     static_cast<epoll_tcp_socket&>(*socket_svc->construct());
     140               0 :                 impl.set_socket(accepted);
     141                 : 
     142               0 :                 impl.desc_state_.fd = accepted;
     143                 :                 {
     144               0 :                     std::lock_guard lock(impl.desc_state_.mutex);
     145               0 :                     impl.desc_state_.read_op    = nullptr;
     146               0 :                     impl.desc_state_.write_op   = nullptr;
     147               0 :                     impl.desc_state_.connect_op = nullptr;
     148               0 :                 }
     149               0 :                 socket_svc->scheduler().register_descriptor(
     150                 :                     accepted, &impl.desc_state_);
     151                 : 
     152               0 :                 impl.set_endpoints(
     153                 :                     local_endpoint_, from_sockaddr(peer_storage));
     154                 : 
     155               0 :                 *ec = {};
     156               0 :                 if (impl_out)
     157               0 :                     *impl_out = &impl;
     158                 :             }
     159                 :             else
     160                 :             {
     161               0 :                 ::close(accepted);
     162               0 :                 *ec = make_err(ENOENT);
     163               0 :                 if (impl_out)
     164               0 :                     *impl_out = nullptr;
     165                 :             }
     166               0 :             op.cont_op.cont.h = h;
     167               0 :             return dispatch_coro(ex, op.cont_op.cont);
     168                 :         }
     169                 : 
     170 HIT           3 :         op.accepted_fd  = accepted;
     171               3 :         op.peer_storage = peer_storage;
     172               3 :         op.complete(0, 0);
     173               3 :         op.impl_ptr = shared_from_this();
     174               3 :         svc_.post(&op);
     175               3 :         return std::noop_coroutine();
     176                 :     }
     177                 : 
     178            4822 :     if (errno == EAGAIN || errno == EWOULDBLOCK)
     179                 :     {
     180            4822 :         op.impl_ptr = shared_from_this();
     181            4822 :         svc_.work_started();
     182                 : 
     183            4822 :         std::lock_guard lock(desc_state_.mutex);
     184            4822 :         bool io_done = false;
     185            4822 :         if (desc_state_.read_ready)
     186                 :         {
     187 MIS           0 :             desc_state_.read_ready = false;
     188               0 :             op.perform_io();
     189               0 :             io_done = (op.errn != EAGAIN && op.errn != EWOULDBLOCK);
     190               0 :             if (!io_done)
     191               0 :                 op.errn = 0;
     192                 :         }
     193                 : 
     194 HIT        4822 :         if (io_done || op.cancelled.load(std::memory_order_acquire))
     195                 :         {
     196 MIS           0 :             svc_.post(&op);
     197               0 :             svc_.work_finished();
     198                 :         }
     199                 :         else
     200                 :         {
     201 HIT        4822 :             desc_state_.read_op = &op;
     202                 :         }
     203            4822 :         return std::noop_coroutine();
     204            4822 :     }
     205                 : 
     206 MIS           0 :     op.complete(errno, 0);
     207               0 :     op.impl_ptr = shared_from_this();
     208               0 :     svc_.post(&op);
     209                 :     // completion is always posted to scheduler queue, never inline.
     210               0 :     return std::noop_coroutine();
     211                 : }
     212                 : 
     213                 : inline void
     214 HIT           2 : epoll_tcp_acceptor::cancel() noexcept
     215                 : {
     216               2 :     do_cancel();
     217               2 : }
     218                 : 
     219                 : inline void
     220             332 : epoll_tcp_acceptor::close_socket() noexcept
     221                 : {
     222             332 :     do_close_socket();
     223             332 : }
     224                 : 
     225             355 : inline epoll_tcp_acceptor_service::epoll_tcp_acceptor_service(
     226             355 :     capy::execution_context& ctx)
     227             355 :     : base_type(ctx)
     228                 : {
     229             355 :     auto* svc = ctx_.find_service<detail::tcp_service>();
     230             355 :     stream_svc_ = svc ? dynamic_cast<epoll_tcp_service*>(svc) : nullptr;
     231             355 : }
     232                 : 
     233             710 : inline epoll_tcp_acceptor_service::~epoll_tcp_acceptor_service() {}
     234                 : 
     235                 : inline std::error_code
     236              82 : epoll_tcp_acceptor_service::open_acceptor_socket(
     237                 :     tcp_acceptor::implementation& impl, int family, int type, int protocol)
     238                 : {
     239              82 :     auto* epoll_impl = static_cast<epoll_tcp_acceptor*>(&impl);
     240              82 :     epoll_impl->close_socket();
     241                 : 
     242              82 :     int fd = ::socket(family, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
     243              82 :     if (fd < 0)
     244 MIS           0 :         return make_err(errno);
     245                 : 
     246 HIT          82 :     if (family == AF_INET6)
     247                 :     {
     248               8 :         int val = 0; // dual-stack default
     249               8 :         ::setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
     250                 :     }
     251                 : 
     252              82 :     epoll_impl->fd_ = fd;
     253                 : 
     254                 :     // Set up descriptor state but do NOT register with epoll yet
     255              82 :     epoll_impl->desc_state_.fd = fd;
     256                 :     {
     257              82 :         std::lock_guard lock(epoll_impl->desc_state_.mutex);
     258              82 :         epoll_impl->desc_state_.read_op = nullptr;
     259              82 :     }
     260                 : 
     261              82 :     return {};
     262                 : }
     263                 : 
     264                 : inline std::error_code
     265              81 : epoll_tcp_acceptor_service::bind_acceptor(
     266                 :     tcp_acceptor::implementation& impl, endpoint ep)
     267                 : {
     268              81 :     return static_cast<epoll_tcp_acceptor*>(&impl)->do_bind(ep);
     269                 : }
     270                 : 
     271                 : inline std::error_code
     272              76 : epoll_tcp_acceptor_service::listen_acceptor(
     273                 :     tcp_acceptor::implementation& impl, int backlog)
     274                 : {
     275              76 :     return static_cast<epoll_tcp_acceptor*>(&impl)->do_listen(backlog);
     276                 : }
     277                 : 
     278                 : } // namespace boost::corosio::detail
     279                 : 
     280                 : #endif // BOOST_COROSIO_HAS_EPOLL
     281                 : 
     282                 : #endif // BOOST_COROSIO_NATIVE_DETAIL_EPOLL_EPOLL_TCP_ACCEPTOR_SERVICE_HPP
        

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