TLA Line data Source code
1 : //
2 : // Copyright (c) 2026 Michael Vandeberg
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_NATIVE_SOCKET_BASE_HPP
11 : #define BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
12 :
13 : #include <boost/corosio/detail/native_handle.hpp>
14 : #include <boost/corosio/endpoint.hpp>
15 : #include <boost/corosio/native/detail/endpoint_convert.hpp>
16 : #include <boost/corosio/native/detail/make_err.hpp>
17 :
18 : #include <memory>
19 : #include <system_error>
20 :
21 : #include <errno.h>
22 : #include <sys/socket.h>
23 :
24 : /*
25 : Readiness/completion-agnostic socket base for the POSIX-fd backends.
26 :
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
29 : descriptor_state) or completion-based (io_uring, which submits SQEs):
30 : the file descriptor, the cached local endpoint, the impl lifecycle
31 : bases (enable_shared_from_this + the service's intrusive tracking node),
32 : and the synchronous accessors (native_handle / options / bind).
33 :
34 : reactor_basic_socket derives from this and adds the readiness machinery
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
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
39 : readiness-agnostic socket surface, while the on-EAGAIN action (park vs
40 : submit-SQE) and the op model stay backend-specific.
41 :
42 : @tparam Derived The concrete socket type (CRTP, for shared_from_this
43 : and the intrusive node).
44 : @tparam ImplBase The public vtable base (tcp_socket::implementation,
45 : udp_socket::implementation, ...).
46 : @tparam Endpoint The endpoint type (endpoint or local_endpoint).
47 : */
48 :
49 : namespace boost::corosio::detail {
50 :
51 : template<class Derived, class ImplBase, class Endpoint = endpoint>
52 : class native_socket_base
53 : : public ImplBase
54 : , public std::enable_shared_from_this<Derived>
55 : {
56 : protected:
57 : // CRTP base: not publicly constructible. The check's preferred fix
58 : // (private ctor + `friend Derived`) is infeasible here — the reactor
59 : // sockets reach this base through intermediate templates
60 : // (reactor_stream_socket -> reactor_basic_socket) that are not `Derived`,
61 : // so a private ctor would stop those intermediates from constructing it.
62 : // Protected is the correct access; suppress the private-only suggestion.
63 : // NOLINTNEXTLINE(bugprone-crtp-constructor-accessibility)
64 HIT 14746 : native_socket_base() = default;
65 :
66 : int fd_ = -1;
67 : // mutable so a derived const local_endpoint() override can lazily fill
68 : // it via getsockname() on first read (io_uring's lazy_pending state).
69 : mutable Endpoint local_endpoint_;
70 :
71 : public:
72 14746 : ~native_socket_base() override = default;
73 :
74 : /// Return the underlying file descriptor.
75 46045 : native_handle_type native_handle() const noexcept override
76 : {
77 46045 : return fd_;
78 : }
79 :
80 : /// Return the cached local endpoint.
81 186 : Endpoint local_endpoint() const noexcept override
82 : {
83 186 : return local_endpoint_;
84 : }
85 :
86 : /// Return true if the socket has an open file descriptor.
87 : bool is_open() const noexcept
88 : {
89 : return fd_ >= 0;
90 : }
91 :
92 : /// Set a socket option.
93 111 : std::error_code set_option(
94 : int level,
95 : int optname,
96 : void const* data,
97 : std::size_t size) noexcept override
98 : {
99 111 : if (::setsockopt(
100 111 : fd_, level, optname, data, static_cast<socklen_t>(size)) != 0)
101 8 : return make_err(errno);
102 103 : return {};
103 : }
104 :
105 : /// Get a socket option.
106 : std::error_code
107 164 : get_option(int level, int optname, void* data, std::size_t* size)
108 : const noexcept override
109 : {
110 164 : socklen_t len = static_cast<socklen_t>(*size);
111 164 : if (::getsockopt(fd_, level, optname, data, &len) != 0)
112 13 : return make_err(errno);
113 151 : *size = static_cast<std::size_t>(len);
114 151 : return {};
115 : }
116 :
117 : /// Assign the file descriptor.
118 4515 : void set_socket(int fd) noexcept
119 : {
120 4515 : fd_ = fd;
121 4515 : }
122 :
123 : /// Cache the local endpoint.
124 : void set_local_endpoint(Endpoint ep) noexcept
125 : {
126 : local_endpoint_ = ep;
127 : }
128 :
129 : /** Bind the socket to a local endpoint.
130 :
131 : Calls ::bind() and caches the resulting local endpoint via
132 : getsockname(). Readiness-agnostic; usable by any fd backend.
133 :
134 : @param ep The endpoint to bind to.
135 : @return Error code on failure, empty on success.
136 : */
137 264 : std::error_code do_bind(Endpoint const& ep) noexcept
138 : {
139 264 : sockaddr_storage storage{};
140 264 : socklen_t addrlen = to_sockaddr(ep, socket_family(fd_), storage);
141 264 : if (::bind(fd_, reinterpret_cast<sockaddr*>(&storage), addrlen) != 0)
142 20 : return make_err(errno);
143 :
144 244 : sockaddr_storage local_storage{};
145 244 : socklen_t local_len = sizeof(local_storage);
146 244 : if (::getsockname(
147 244 : fd_, reinterpret_cast<sockaddr*>(&local_storage), &local_len) ==
148 : 0)
149 183 : local_endpoint_ =
150 244 : from_sockaddr_as(local_storage, local_len, Endpoint{});
151 :
152 244 : return {};
153 : }
154 : };
155 :
156 : } // namespace boost::corosio::detail
157 :
158 : #endif // BOOST_COROSIO_NATIVE_DETAIL_NATIVE_SOCKET_BASE_HPP
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