106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
/*
|
|
* Copyright 2003-2021 The Music Player Daemon Project
|
|
* http://www.musicpd.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "EventPipe.hxx"
|
|
#include "io/FileDescriptor.hxx"
|
|
#include "system/Error.hxx"
|
|
#include "util/Compiler.h"
|
|
|
|
#include <cassert>
|
|
|
|
#include <unistd.h>
|
|
|
|
#ifdef _WIN32
|
|
#include "net/IPv4Address.hxx"
|
|
#include "net/StaticSocketAddress.hxx"
|
|
#include "net/UniqueSocketDescriptor.hxx"
|
|
#include "net/SocketError.hxx"
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
static void PoorSocketPair(UniqueSocketDescriptor &socket0,
|
|
UniqueSocketDescriptor &socket01);
|
|
#endif
|
|
|
|
EventPipe::EventPipe()
|
|
{
|
|
#ifdef _WIN32
|
|
PoorSocketPair(r, w);
|
|
#else
|
|
if (!UniqueFileDescriptor::CreatePipeNonBlock(r, w))
|
|
throw MakeErrno("pipe() has failed");
|
|
#endif
|
|
}
|
|
|
|
EventPipe::~EventPipe() noexcept = default;
|
|
|
|
bool
|
|
EventPipe::Read() noexcept
|
|
{
|
|
assert(r.IsDefined());
|
|
assert(w.IsDefined());
|
|
|
|
char buffer[256];
|
|
return r.Read(buffer, sizeof(buffer)) > 0;
|
|
}
|
|
|
|
void
|
|
EventPipe::Write() noexcept
|
|
{
|
|
assert(r.IsDefined());
|
|
assert(w.IsDefined());
|
|
|
|
w.Write("", 1);
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
|
|
/* Our poor man's socketpair() implementation
|
|
* Due to limited protocol/address family support
|
|
* it's better to keep this as a private implementation detail of EventPipe
|
|
* rather than wide-available API.
|
|
*/
|
|
static void
|
|
PoorSocketPair(UniqueSocketDescriptor &socket0, UniqueSocketDescriptor &socket1)
|
|
{
|
|
UniqueSocketDescriptor listen_socket;
|
|
if (!listen_socket.Create(AF_INET, SOCK_STREAM, IPPROTO_TCP))
|
|
throw MakeSocketError("Failed to create socket");
|
|
|
|
if (!listen_socket.Bind(IPv4Address(IPv4Address::Loopback(), 0)))
|
|
throw MakeSocketError("Failed to create socket");
|
|
|
|
if (!listen_socket.Listen(1))
|
|
throw MakeSocketError("Failed to listen on socket");
|
|
|
|
if (!socket0.Create(AF_INET, SOCK_STREAM, IPPROTO_TCP))
|
|
throw MakeSocketError("Failed to create socket");
|
|
|
|
if (!socket0.Connect(listen_socket.GetLocalAddress()))
|
|
throw MakeSocketError("Failed to connect socket");
|
|
|
|
socket0.SetNonBlocking();
|
|
|
|
socket1 = listen_socket.AcceptNonBlock();
|
|
if (!socket1.IsDefined())
|
|
throw MakeSocketError("Failed to accept connection");
|
|
}
|
|
|
|
#endif
|