133 lines
3.1 KiB
C++
133 lines
3.1 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "EventPipe.hxx"
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#include "FileDescriptor.hxx"
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#include "system/Error.hxx"
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#include "util/ScopeExit.hxx"
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#include "Compiler.h"
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#include <assert.h>
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#include <unistd.h>
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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(int fd[2]);
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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(fds);
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#else
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FileDescriptor r, w;
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if (!FileDescriptor::CreatePipeNonBlock(r, w))
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throw MakeErrno("pipe() has failed");
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fds[0] = r.Steal();
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fds[1] = w.Steal();
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#endif
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}
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EventPipe::~EventPipe()
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{
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#ifdef _WIN32
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closesocket(fds[0]);
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closesocket(fds[1]);
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#else
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close(fds[0]);
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close(fds[1]);
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#endif
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}
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bool
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EventPipe::Read()
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{
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assert(fds[0] >= 0);
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assert(fds[1] >= 0);
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char buffer[256];
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#ifdef _WIN32
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return recv(fds[0], buffer, sizeof(buffer), 0) > 0;
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#else
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return read(fds[0], buffer, sizeof(buffer)) > 0;
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#endif
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}
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void
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EventPipe::Write()
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{
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assert(fds[0] >= 0);
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assert(fds[1] >= 0);
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#ifdef _WIN32
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send(fds[1], "", 1, 0);
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#else
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gcc_unused ssize_t nbytes = write(fds[1], "", 1);
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#endif
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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(int fd[2])
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{
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assert (fd != nullptr);
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UniqueSocketDescriptor listen_socket;
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if (!listen_socket.CreateNonBlock(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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UniqueSocketDescriptor socket0;
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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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auto 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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fd[0] = socket0.Steal();
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fd[1] = socket1.Steal();
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}
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#endif
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