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author | Max Kellermann <max@duempel.org> | 2013-08-06 23:25:57 +0200 |
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committer | Max Kellermann <max@duempel.org> | 2013-08-06 23:32:21 +0200 |
commit | 47e16dbee3d43a8fac8e2337df442814ec6d036b (patch) | |
tree | 011c45b1d151425adaef1168fcf6ba7238d6e82a /src/event/WakeFD.cxx | |
parent | 66f678023f6e18dde9679d0a69565d6a50d09ed4 (diff) | |
download | mpd-47e16dbee3d43a8fac8e2337df442814ec6d036b.tar.gz mpd-47e16dbee3d43a8fac8e2337df442814ec6d036b.tar.xz mpd-47e16dbee3d43a8fac8e2337df442814ec6d036b.zip |
configure.ac: add option --enable-eventfd
Remove the runtime check for eventfd(), hard-code the feature once
it's been selected at compile time. The class WakeFD is splitted into
EventFD and EventPipe, using WakeFD as a macro diversion.
Diffstat (limited to 'src/event/WakeFD.cxx')
-rw-r--r-- | src/event/WakeFD.cxx | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/src/event/WakeFD.cxx b/src/event/WakeFD.cxx deleted file mode 100644 index 1a84f5645..000000000 --- a/src/event/WakeFD.cxx +++ /dev/null @@ -1,225 +0,0 @@ -/* - * Copyright (C) 2003-2013 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 "config.h" -#include "WakeFD.hxx" -#include "fd_util.h" -#include "gcc.h" - -#include <unistd.h> - -#ifdef WIN32 -#include <ws2tcpip.h> -#include <winsock2.h> -#include <cstring> /* for memset() */ -#endif - -#ifdef HAVE_EVENTFD -#include <sys/eventfd.h> -#endif - -#ifdef WIN32 -static bool PoorSocketPair(int fd[2]); -#endif - -bool -WakeFD::Create() -{ - assert(fds[0] == -1); - assert(fds[1] == -1); - -#ifdef WIN32 - return PoorSocketPair(fds); -#else -#ifdef HAVE_EVENTFD - fds[0] = eventfd_cloexec_nonblock(0, 0); - if (fds[0] >= 0) { - fds[1] = -2; - return true; - } -#endif - return pipe_cloexec_nonblock(fds) >= 0; -#endif -} - -void -WakeFD::Destroy() -{ -#ifdef WIN32 - closesocket(fds[0]); - closesocket(fds[1]); -#else - close(fds[0]); -#ifdef HAVE_EVENTFD - if (!IsEventFD()) -#endif - close(fds[1]); -#endif - -#ifndef NDEBUG - fds[0] = -1; - fds[1] = -1; -#endif -} - -bool -WakeFD::Read() -{ - assert(fds[0] >= 0); - -#ifdef WIN32 - assert(fds[1] >= 0); - char buffer[256]; - return recv(fds[0], buffer, sizeof(buffer), 0) > 0; -#else - -#ifdef HAVE_EVENTFD - if (IsEventFD()) { - eventfd_t value; - return read(fds[0], &value, - sizeof(value)) == (ssize_t)sizeof(value); - } -#endif - - assert(fds[1] >= 0); - - char buffer[256]; - return read(fds[0], buffer, sizeof(buffer)) > 0; -#endif -} - -void -WakeFD::Write() -{ - assert(fds[0] >= 0); - -#ifdef WIN32 - assert(fds[1] >= 0); - - send(fds[1], "", 1, 0); -#else - -#ifdef HAVE_EVENTFD - if (IsEventFD()) { - static constexpr eventfd_t value = 1; - gcc_unused ssize_t nbytes = - write(fds[0], &value, sizeof(value)); - return; - } -#endif - - assert(fds[1] >= 0); - - gcc_unused ssize_t nbytes = write(fds[1], "", 1); -#endif -} - -#ifdef WIN32 - -static void SafeCloseSocket(SOCKET s) -{ - int error = WSAGetLastError(); - closesocket(s); - WSASetLastError(error); -} - -/* Our poor man's socketpair() implementation - * Due to limited protocol/address family support and primitive error handling - * it's better to keep this as a private implementation detail of WakeFD - * rather than wide-available API. - */ -static bool PoorSocketPair(int fd[2]) -{ - assert (fd != nullptr); - - SOCKET listen_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if (listen_socket == INVALID_SOCKET) - return false; - - sockaddr_in address; - std::memset(&address, 0, sizeof(address)); - address.sin_family = AF_INET; - address.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - - int ret = bind(listen_socket, - reinterpret_cast<sockaddr*>(&address), - sizeof(address)); - - if (ret < 0) { - SafeCloseSocket(listen_socket); - return false; - } - - ret = listen(listen_socket, 1); - - if (ret < 0) { - SafeCloseSocket(listen_socket); - return false; - } - - int address_len = sizeof(address); - ret = getsockname(listen_socket, - reinterpret_cast<sockaddr*>(&address), - &address_len); - - if (ret < 0) { - SafeCloseSocket(listen_socket); - return false; - } - - SOCKET socket0 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if (socket0 == INVALID_SOCKET) { - SafeCloseSocket(listen_socket); - return false; - } - - ret = connect(socket0, - reinterpret_cast<sockaddr*>(&address), - sizeof(address)); - - if (ret < 0) { - SafeCloseSocket(listen_socket); - SafeCloseSocket(socket0); - return false; - } - - SOCKET socket1 = accept(listen_socket, nullptr, nullptr); - if (socket1 == INVALID_SOCKET) { - SafeCloseSocket(listen_socket); - SafeCloseSocket(socket0); - return false; - } - - SafeCloseSocket(listen_socket); - - u_long non_block = 1; - if (ioctlsocket(socket0, FIONBIO, &non_block) < 0 - || ioctlsocket(socket1, FIONBIO, &non_block) < 0) { - SafeCloseSocket(socket0); - SafeCloseSocket(socket1); - return false; - } - - fd[0] = static_cast<int>(socket0); - fd[1] = static_cast<int>(socket1); - - return true; -} - -#endif |