. /include/boost/corosio /native /detail /native_socket_base.hpp
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1   // 1   //
2   // Copyright (c) 2026 Michael Vandeberg 2   // Copyright (c) 2026 Michael Vandeberg
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 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) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/corosio 7   // Official repository: https://github.com/cppalliance/corosio
8   // 8   //
9   9  
10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP 10   #ifndef BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
11   #define BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP 11   #define BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
12   12  
13   #include <boost/corosio/detail/native_handle.hpp> 13   #include <boost/corosio/detail/native_handle.hpp>
14   #include <boost/corosio/endpoint.hpp> 14   #include <boost/corosio/endpoint.hpp>
15   #include <boost/corosio/native/detail/endpoint_convert.hpp> 15   #include <boost/corosio/native/detail/endpoint_convert.hpp>
16   #include <boost/corosio/native/detail/make_err.hpp> 16   #include <boost/corosio/native/detail/make_err.hpp>
17   17  
18   #include <memory> 18   #include <memory>
19   #include <system_error> 19   #include <system_error>
20   20  
21   #include <errno.h> 21   #include <errno.h>
22   #include <sys/socket.h> 22   #include <sys/socket.h>
23   23  
24   /* 24   /*
25   Readiness/completion-agnostic socket base for the POSIX-fd backends. 25   Readiness/completion-agnostic socket base for the POSIX-fd backends.
26   26  
27   Holds the part of a socket impl that does not care whether the backend 27   Holds the part of a socket impl that does not care whether the backend
28   is readiness-based (epoll/kqueue/select, which park ops on a 28   is readiness-based (epoll/kqueue/select, which park ops on a
29   descriptor_state) or completion-based (io_uring, which submits SQEs): 29   descriptor_state) or completion-based (io_uring, which submits SQEs):
30   the file descriptor, the cached local endpoint, the impl lifecycle 30   the file descriptor, the cached local endpoint, the impl lifecycle
31   bases (enable_shared_from_this + the service's intrusive tracking node), 31   bases (enable_shared_from_this + the service's intrusive tracking node),
32   and the synchronous accessors (native_handle / options / bind). 32   and the synchronous accessors (native_handle / options / bind).
33   33  
34   reactor_basic_socket derives from this and adds the readiness machinery 34   reactor_basic_socket derives from this and adds the readiness machinery
35   (descriptor_state, register_op, the cancel/close that deregister from 35   (descriptor_state, register_op, the cancel/close that deregister from
36   the reactor). io_uring's socket impls derive from it and add their op 36   the reactor). io_uring's socket impls derive from it and add their op
37   slots + SQE submission. This is the socket-layer analogue of io_uring 37   slots + SQE submission. This is the socket-layer analogue of io_uring
38   deriving from reactor_scheduler: io_uring sockets share the reactor's 38   deriving from reactor_scheduler: io_uring sockets share the reactor's
39   readiness-agnostic socket surface, while the on-EAGAIN action (park vs 39   readiness-agnostic socket surface, while the on-EAGAIN action (park vs
40   submit-SQE) and the op model stay backend-specific. 40   submit-SQE) and the op model stay backend-specific.
41   41  
42   @tparam Derived The concrete socket type (CRTP, for shared_from_this 42   @tparam Derived The concrete socket type (CRTP, for shared_from_this
43   and the intrusive node). 43   and the intrusive node).
44   @tparam ImplBase The public vtable base (tcp_socket::implementation, 44   @tparam ImplBase The public vtable base (tcp_socket::implementation,
45   udp_socket::implementation, ...). 45   udp_socket::implementation, ...).
46   @tparam Endpoint The endpoint type (endpoint or local_endpoint). 46   @tparam Endpoint The endpoint type (endpoint or local_endpoint).
47   */ 47   */
48   48  
49   namespace boost::corosio::detail { 49   namespace boost::corosio::detail {
50   50  
51   template<class Derived, class ImplBase, class Endpoint = endpoint> 51   template<class Derived, class ImplBase, class Endpoint = endpoint>
52   class native_socket_base 52   class native_socket_base
53   : public ImplBase 53   : public ImplBase
54   , public std::enable_shared_from_this<Derived> 54   , public std::enable_shared_from_this<Derived>
55   { 55   {
56   protected: 56   protected:
57   // CRTP base: not publicly constructible. The check's preferred fix 57   // CRTP base: not publicly constructible. The check's preferred fix
58   // (private ctor + `friend Derived`) is infeasible here — the reactor 58   // (private ctor + `friend Derived`) is infeasible here — the reactor
59   // sockets reach this base through intermediate templates 59   // sockets reach this base through intermediate templates
60   // (reactor_stream_socket -> reactor_basic_socket) that are not `Derived`, 60   // (reactor_stream_socket -> reactor_basic_socket) that are not `Derived`,
61   // so a private ctor would stop those intermediates from constructing it. 61   // so a private ctor would stop those intermediates from constructing it.
62   // Protected is the correct access; suppress the private-only suggestion. 62   // Protected is the correct access; suppress the private-only suggestion.
HITCBC 63   13428 native_socket_base() = default; // NOLINT(bugprone-crtp-constructor-accessibility) 63   6386 native_socket_base() = default; // NOLINT(bugprone-crtp-constructor-accessibility)
64   64  
65   int fd_ = -1; 65   int fd_ = -1;
66   // mutable so a derived const local_endpoint() override can lazily fill 66   // mutable so a derived const local_endpoint() override can lazily fill
67   // it via getsockname() on first read (io_uring's lazy_pending state). 67   // it via getsockname() on first read (io_uring's lazy_pending state).
68   mutable Endpoint local_endpoint_; 68   mutable Endpoint local_endpoint_;
69   69  
70   public: 70   public:
HITCBC 71   13428 ~native_socket_base() override = default; 71   6386 ~native_socket_base() override = default;
72   72  
73   /// Return the underlying file descriptor. 73   /// Return the underlying file descriptor.
HITCBC 74   41167 native_handle_type native_handle() const noexcept override 74   20034 native_handle_type native_handle() const noexcept override
75   { 75   {
HITCBC 76   41167 return fd_; 76   20034 return fd_;
77   } 77   }
78   78  
79   /// Return the cached local endpoint. 79   /// Return the cached local endpoint.
HITCBC 80   106 Endpoint local_endpoint() const noexcept override 80   106 Endpoint local_endpoint() const noexcept override
81   { 81   {
HITCBC 82   106 return local_endpoint_; 82   106 return local_endpoint_;
83   } 83   }
84   84  
85   /// Return true if the socket has an open file descriptor. 85   /// Return true if the socket has an open file descriptor.
86   bool is_open() const noexcept 86   bool is_open() const noexcept
87   { 87   {
88   return fd_ >= 0; 88   return fd_ >= 0;
89   } 89   }
90   90  
91   /// Set a socket option. 91   /// Set a socket option.
HITCBC 92   66 std::error_code set_option( 92   66 std::error_code set_option(
93   int level, int optname, void const* data, std::size_t size) 93   int level, int optname, void const* data, std::size_t size)
94   noexcept override 94   noexcept override
95   { 95   {
HITCBC 96   66 if (::setsockopt( 96   66 if (::setsockopt(
HITCBC 97   66 fd_, level, optname, data, static_cast<socklen_t>(size)) != 0) 97   66 fd_, level, optname, data, static_cast<socklen_t>(size)) != 0)
HITCBC 98   2 return make_err(errno); 98   2 return make_err(errno);
HITCBC 99   64 return {}; 99   64 return {};
100   } 100   }
101   101  
102   /// Get a socket option. 102   /// Get a socket option.
HITCBC 103   102 std::error_code get_option( 103   102 std::error_code get_option(
104   int level, int optname, void* data, std::size_t* size) 104   int level, int optname, void* data, std::size_t* size)
105   const noexcept override 105   const noexcept override
106   { 106   {
HITCBC 107   102 socklen_t len = static_cast<socklen_t>(*size); 107   102 socklen_t len = static_cast<socklen_t>(*size);
HITCBC 108   102 if (::getsockopt(fd_, level, optname, data, &len) != 0) 108   102 if (::getsockopt(fd_, level, optname, data, &len) != 0)
MISUBC 109   ✗ return make_err(errno); 109   ✗ return make_err(errno);
HITCBC 110   102 *size = static_cast<std::size_t>(len); 110   102 *size = static_cast<std::size_t>(len);
HITCBC 111   102 return {}; 111   102 return {};
112   } 112   }
113   113  
114   /// Assign the file descriptor. 114   /// Assign the file descriptor.
HITCBC 115   4293 void set_socket(int fd) noexcept 115   1946 void set_socket(int fd) noexcept
116   { 116   {
HITCBC 117   4293 fd_ = fd; 117   1946 fd_ = fd;
HITCBC 118   4293 } 118   1946 }
119   119  
120   /// Cache the local endpoint. 120   /// Cache the local endpoint.
121   void set_local_endpoint(Endpoint ep) noexcept 121   void set_local_endpoint(Endpoint ep) noexcept
122   { 122   {
123   local_endpoint_ = ep; 123   local_endpoint_ = ep;
124   } 124   }
125   125  
126   /** Bind the socket to a local endpoint. 126   /** Bind the socket to a local endpoint.
127   127  
128   Calls ::bind() and caches the resulting local endpoint via 128   Calls ::bind() and caches the resulting local endpoint via
129   getsockname(). Readiness-agnostic; usable by any fd backend. 129   getsockname(). Readiness-agnostic; usable by any fd backend.
130   130  
131   @param ep The endpoint to bind to. 131   @param ep The endpoint to bind to.
132   @return Error code on failure, empty on success. 132   @return Error code on failure, empty on success.
133   */ 133   */
HITCBC 134   136 std::error_code do_bind(Endpoint const& ep) noexcept 134   136 std::error_code do_bind(Endpoint const& ep) noexcept
135   { 135   {
HITCBC 136   136 sockaddr_storage storage{}; 136   136 sockaddr_storage storage{};
HITCBC 137   136 socklen_t addrlen = to_sockaddr(ep, socket_family(fd_), storage); 137   136 socklen_t addrlen = to_sockaddr(ep, socket_family(fd_), storage);
HITCBC 138   136 if (::bind(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen) != 0) 138   136 if (::bind(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen) != 0)
HITCBC 139   10 return make_err(errno); 139   10 return make_err(errno);
140   140  
HITCBC 141   126 sockaddr_storage local_storage{}; 141   126 sockaddr_storage local_storage{};
HITCBC 142   126 socklen_t local_len = sizeof(local_storage); 142   126 socklen_t local_len = sizeof(local_storage);
HITCBC 143   126 if (::getsockname( 143   126 if (::getsockname(
144   fd_, reinterpret_cast<sockaddr*>(&local_storage), &local_len) 144   fd_, reinterpret_cast<sockaddr*>(&local_storage), &local_len)
HITCBC 145   126 == 0) 145   126 == 0)
HITCBC 146   96 local_endpoint_ = 146   96 local_endpoint_ =
HITCBC 147   126 from_sockaddr_as(local_storage, local_len, Endpoint{}); 147   126 from_sockaddr_as(local_storage, local_len, Endpoint{});
148   148  
HITCBC 149   126 return {}; 149   126 return {};
150   } 150   }
151   }; 151   };
152   152  
153   } // namespace boost::corosio::detail 153   } // namespace boost::corosio::detail
154   154  
155   #endif // BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP 155   #endif // BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP