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-rw-r--r--src/system/EventFD.cxx65
-rw-r--r--src/system/EventFD.hxx57
-rw-r--r--src/system/EventPipe.cxx180
-rw-r--r--src/system/EventPipe.hxx57
4 files changed, 359 insertions, 0 deletions
diff --git a/src/system/EventFD.cxx b/src/system/EventFD.cxx
new file mode 100644
index 000000000..716ff80ae
--- /dev/null
+++ b/src/system/EventFD.cxx
@@ -0,0 +1,65 @@
+/*
+ * 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"
+#ifdef USE_EVENTFD
+#include "EventFD.hxx"
+#include "system/fd_util.h"
+#include "system/FatalError.hxx"
+#include "gcc.h"
+
+#include <assert.h>
+#include <unistd.h>
+
+#include <sys/eventfd.h>
+
+EventFD::EventFD()
+ :fd(eventfd_cloexec_nonblock(0, 0))
+{
+ if (fd < 0)
+ FatalSystemError("eventfd() failed");
+}
+
+EventFD::~EventFD()
+{
+ assert(fd >= 0);
+
+ close(fd);
+}
+
+bool
+EventFD::Read()
+{
+ assert(fd >= 0);
+
+ eventfd_t value;
+ return read(fd, &value, sizeof(value)) == (ssize_t)sizeof(value);
+}
+
+void
+EventFD::Write()
+{
+ assert(fd >= 0);
+
+ static constexpr eventfd_t value = 1;
+ gcc_unused ssize_t nbytes =
+ write(fd, &value, sizeof(value));
+}
+
+#endif /* USE_EVENTFD */
diff --git a/src/system/EventFD.hxx b/src/system/EventFD.hxx
new file mode 100644
index 000000000..67a0258ab
--- /dev/null
+++ b/src/system/EventFD.hxx
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+
+#ifndef MPD_EVENT_FD_HXX
+#define MPD_EVENT_FD_HXX
+
+#include "check.h"
+
+/**
+ * A class that wraps eventfd().
+ *
+ * Errors in the constructor are fatal.
+ */
+class EventFD {
+ int fd;
+
+public:
+ EventFD();
+ ~EventFD();
+
+ EventFD(const EventFD &other) = delete;
+ EventFD &operator=(const EventFD &other) = delete;
+
+ int Get() const {
+ return fd;
+ }
+
+ /**
+ * Checks if Write() was called at least once since the last
+ * Read() call.
+ */
+ bool Read();
+
+ /**
+ * Wakes up the reader. Multiple calls to this function will
+ * be combined to one wakeup.
+ */
+ void Write();
+};
+
+#endif
diff --git a/src/system/EventPipe.cxx b/src/system/EventPipe.cxx
new file mode 100644
index 000000000..e1a38c503
--- /dev/null
+++ b/src/system/EventPipe.cxx
@@ -0,0 +1,180 @@
+/*
+ * 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 "EventPipe.hxx"
+#include "system/fd_util.h"
+#include "system/FatalError.hxx"
+#include "gcc.h"
+
+#include <assert.h>
+#include <unistd.h>
+
+#ifdef WIN32
+#include <ws2tcpip.h>
+#include <winsock2.h>
+#include <cstring> /* for memset() */
+#endif
+
+#ifdef WIN32
+static bool PoorSocketPair(int fd[2]);
+#endif
+
+EventPipe::EventPipe()
+{
+#ifdef WIN32
+ bool success = PoorSocketPair(fds);
+#else
+ bool success = pipe_cloexec_nonblock(fds) >= 0;
+#endif
+ if (!success)
+ FatalSystemError("pipe() has failed");
+}
+
+EventPipe::~EventPipe()
+{
+#ifdef WIN32
+ closesocket(fds[0]);
+ closesocket(fds[1]);
+#else
+ close(fds[0]);
+ close(fds[1]);
+#endif
+}
+
+bool
+EventPipe::Read()
+{
+ assert(fds[0] >= 0);
+ assert(fds[1] >= 0);
+
+ char buffer[256];
+#ifdef WIN32
+ return recv(fds[0], buffer, sizeof(buffer), 0) > 0;
+#else
+ return read(fds[0], buffer, sizeof(buffer)) > 0;
+#endif
+}
+
+void
+EventPipe::Write()
+{
+ assert(fds[0] >= 0);
+ assert(fds[1] >= 0);
+
+#ifdef WIN32
+ send(fds[1], "", 1, 0);
+#else
+ 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 EventPipe
+ * 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
diff --git a/src/system/EventPipe.hxx b/src/system/EventPipe.hxx
new file mode 100644
index 000000000..86a10b0bb
--- /dev/null
+++ b/src/system/EventPipe.hxx
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+
+#ifndef MPD_EVENT_PIPE_HXX
+#define MPD_EVENT_PIPE_HXX
+
+#include "check.h"
+
+/**
+ * A pipe that can be used to trigger an event to the read side.
+ *
+ * Errors in the constructor are fatal.
+ */
+class EventPipe {
+ int fds[2];
+
+public:
+ EventPipe();
+ ~EventPipe();
+
+ EventPipe(const EventPipe &other) = delete;
+ EventPipe &operator=(const EventPipe &other) = delete;
+
+ int Get() const {
+ return fds[0];
+ }
+
+ /**
+ * Checks if Write() was called at least once since the last
+ * Read() call.
+ */
+ bool Read();
+
+ /**
+ * Wakes up the reader. Multiple calls to this function will
+ * be combined to one wakeup.
+ */
+ void Write();
+};
+
+#endif /* MAIN_NOTIFY_H */
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