88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "EventPipe.hxx"
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#include "io/FileDescriptor.hxx"
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#include "system/Error.hxx"
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#include <cassert>
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#ifdef _WIN32
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#include "net/IPv4Address.hxx"
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#include "net/StaticSocketAddress.hxx"
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#include "net/UniqueSocketDescriptor.hxx"
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#include "net/SocketError.hxx"
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#endif
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#ifdef _WIN32
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static void PoorSocketPair(UniqueSocketDescriptor &socket0,
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UniqueSocketDescriptor &socket01);
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#endif
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EventPipe::EventPipe()
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{
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#ifdef _WIN32
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PoorSocketPair(r, w);
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#else
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if (!UniqueFileDescriptor::CreatePipeNonBlock(r, w))
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throw MakeErrno("pipe() has failed");
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#endif
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}
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EventPipe::~EventPipe() noexcept = default;
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bool
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EventPipe::Read() noexcept
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{
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assert(r.IsDefined());
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assert(w.IsDefined());
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std::byte buffer[256];
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return r.Read(buffer) > 0;
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}
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void
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EventPipe::Write() noexcept
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{
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assert(r.IsDefined());
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assert(w.IsDefined());
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static constexpr std::byte buffer[1]{};
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(void)w.Write(buffer);
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}
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#ifdef _WIN32
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/* Our poor man's socketpair() implementation
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* Due to limited protocol/address family support
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* it's better to keep this as a private implementation detail of EventPipe
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* rather than wide-available API.
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*/
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static void
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PoorSocketPair(UniqueSocketDescriptor &socket0, UniqueSocketDescriptor &socket1)
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{
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UniqueSocketDescriptor listen_socket;
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if (!listen_socket.Create(AF_INET, SOCK_STREAM, IPPROTO_TCP))
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throw MakeSocketError("Failed to create socket");
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if (!listen_socket.Bind(IPv4Address(IPv4Address::Loopback(), 0)))
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throw MakeSocketError("Failed to create socket");
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if (!listen_socket.Listen(1))
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throw MakeSocketError("Failed to listen on socket");
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if (!socket0.Create(AF_INET, SOCK_STREAM, IPPROTO_TCP))
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throw MakeSocketError("Failed to create socket");
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if (!socket0.Connect(listen_socket.GetLocalAddress()))
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throw MakeSocketError("Failed to connect socket");
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socket0.SetNonBlocking();
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socket1 = listen_socket.AcceptNonBlock();
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if (!socket1.IsDefined())
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throw MakeSocketError("Failed to accept connection");
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}
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#endif
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