181 lines
3.8 KiB
C++
181 lines
3.8 KiB
C++
/*
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* Copyright (C) 2003-2013 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 "system/fd_util.h"
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#include "system/FatalError.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 <ws2tcpip.h>
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#include <winsock2.h>
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#include <cstring> /* for memset() */
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#endif
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#ifdef WIN32
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static bool 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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bool success = PoorSocketPair(fds);
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#else
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bool success = pipe_cloexec_nonblock(fds) >= 0;
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#endif
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if (!success)
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FatalSystemError("pipe() has failed");
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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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static void SafeCloseSocket(SOCKET s)
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{
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int error = WSAGetLastError();
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closesocket(s);
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WSASetLastError(error);
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}
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/* Our poor man's socketpair() implementation
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* Due to limited protocol/address family support and primitive error handling
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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 bool PoorSocketPair(int fd[2])
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{
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assert (fd != nullptr);
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SOCKET listen_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (listen_socket == INVALID_SOCKET)
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return false;
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sockaddr_in address;
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std::memset(&address, 0, sizeof(address));
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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int ret = bind(listen_socket,
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reinterpret_cast<sockaddr*>(&address),
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sizeof(address));
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if (ret < 0) {
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SafeCloseSocket(listen_socket);
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return false;
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}
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ret = listen(listen_socket, 1);
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if (ret < 0) {
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SafeCloseSocket(listen_socket);
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return false;
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}
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int address_len = sizeof(address);
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ret = getsockname(listen_socket,
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reinterpret_cast<sockaddr*>(&address),
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&address_len);
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if (ret < 0) {
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SafeCloseSocket(listen_socket);
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return false;
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}
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SOCKET socket0 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (socket0 == INVALID_SOCKET) {
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SafeCloseSocket(listen_socket);
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return false;
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}
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ret = connect(socket0,
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reinterpret_cast<sockaddr*>(&address),
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sizeof(address));
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if (ret < 0) {
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SafeCloseSocket(listen_socket);
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SafeCloseSocket(socket0);
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return false;
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}
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SOCKET socket1 = accept(listen_socket, nullptr, nullptr);
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if (socket1 == INVALID_SOCKET) {
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SafeCloseSocket(listen_socket);
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SafeCloseSocket(socket0);
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return false;
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}
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SafeCloseSocket(listen_socket);
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u_long non_block = 1;
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if (ioctlsocket(socket0, FIONBIO, &non_block) < 0
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|| ioctlsocket(socket1, FIONBIO, &non_block) < 0) {
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SafeCloseSocket(socket0);
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SafeCloseSocket(socket1);
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return false;
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}
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fd[0] = static_cast<int>(socket0);
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fd[1] = static_cast<int>(socket1);
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return true;
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}
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#endif
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