diff options
Diffstat (limited to 'src/event')
| -rw-r--r-- | src/event/BufferedSocket.cxx | 150 | ||||
| -rw-r--r-- | src/event/BufferedSocket.hxx | 104 | ||||
| -rw-r--r-- | src/event/FullyBufferedSocket.cxx | 132 | ||||
| -rw-r--r-- | src/event/FullyBufferedSocket.hxx | 63 | ||||
| -rw-r--r-- | src/event/Loop.hxx | 88 | ||||
| -rw-r--r-- | src/event/MultiSocketMonitor.cxx | 107 | ||||
| -rw-r--r-- | src/event/MultiSocketMonitor.hxx | 125 | ||||
| -rw-r--r-- | src/event/ServerSocket.cxx | 438 | ||||
| -rw-r--r-- | src/event/ServerSocket.hxx | 121 | ||||
| -rw-r--r-- | src/event/SocketMonitor.cxx | 167 | ||||
| -rw-r--r-- | src/event/SocketMonitor.hxx | 148 | ||||
| -rw-r--r-- | src/event/TimeoutMonitor.cxx | 65 | ||||
| -rw-r--r-- | src/event/TimeoutMonitor.hxx | 60 | ||||
| -rw-r--r-- | src/event/WakeFD.cxx | 225 | ||||
| -rw-r--r-- | src/event/WakeFD.hxx | 80 |
15 files changed, 2073 insertions, 0 deletions
diff --git a/src/event/BufferedSocket.cxx b/src/event/BufferedSocket.cxx new file mode 100644 index 00000000..05e70344 --- /dev/null +++ b/src/event/BufferedSocket.cxx @@ -0,0 +1,150 @@ +/* + * 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 "BufferedSocket.hxx" +#include "SocketError.hxx" +#include "util/fifo_buffer.h" + +#include <assert.h> +#include <stdint.h> +#include <string.h> + +BufferedSocket::~BufferedSocket() +{ + if (input != nullptr) + fifo_buffer_free(input); +} + +BufferedSocket::ssize_t +BufferedSocket::DirectRead(void *data, size_t length) +{ + const auto nbytes = SocketMonitor::Read((char *)data, length); + if (gcc_likely(nbytes > 0)) + return nbytes; + + if (nbytes == 0) { + OnSocketClosed(); + return -1; + } + + const auto code = GetSocketError(); + if (IsSocketErrorAgain(code)) + return 0; + + if (IsSocketErrorClosed(code)) + OnSocketClosed(); + else + OnSocketError(NewSocketError(code)); + return -1; +} + +bool +BufferedSocket::ReadToBuffer() +{ + assert(IsDefined()); + + if (input == nullptr) + input = fifo_buffer_new(8192); + + size_t length; + void *buffer = fifo_buffer_write(input, &length); + assert(buffer != nullptr); + + const auto nbytes = DirectRead(buffer, length); + if (nbytes > 0) + fifo_buffer_append(input, nbytes); + + return nbytes >= 0; +} + +bool +BufferedSocket::ResumeInput() +{ + assert(IsDefined()); + + if (input == nullptr) { + ScheduleRead(); + return true; + } + + while (true) { + size_t length; + const void *data = fifo_buffer_read(input, &length); + if (data == nullptr) { + ScheduleRead(); + return true; + } + + const auto result = OnSocketInput(data, length); + switch (result) { + case InputResult::MORE: + if (fifo_buffer_is_full(input)) { + // TODO + OnSocketError(g_error_new_literal(g_quark_from_static_string("buffered_socket"), + 0, "Input buffer is full")); + return false; + } + + ScheduleRead(); + return true; + + case InputResult::PAUSE: + CancelRead(); + return true; + + case InputResult::AGAIN: + continue; + + case InputResult::CLOSED: + return false; + } + } +} + +void +BufferedSocket::ConsumeInput(size_t nbytes) +{ + assert(IsDefined()); + + fifo_buffer_consume(input, nbytes); +} + +bool +BufferedSocket::OnSocketReady(unsigned flags) +{ + assert(IsDefined()); + + if (gcc_unlikely(flags & (ERROR|HANGUP))) { + OnSocketClosed(); + return false; + } + + if (flags & READ) { + assert(input == nullptr || !fifo_buffer_is_full(input)); + + if (!ReadToBuffer() || !ResumeInput()) + return false; + + if (input == nullptr || !fifo_buffer_is_full(input)) + ScheduleRead(); + } + + return true; +} diff --git a/src/event/BufferedSocket.hxx b/src/event/BufferedSocket.hxx new file mode 100644 index 00000000..86deb8d9 --- /dev/null +++ b/src/event/BufferedSocket.hxx @@ -0,0 +1,104 @@ +/* + * 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_BUFFERED_SOCKET_HXX +#define MPD_BUFFERED_SOCKET_HXX + +#include "check.h" +#include "SocketMonitor.hxx" +#include "gcc.h" + +struct fifo_buffer; + +/** + * A #SocketMonitor specialization that adds an input buffer. + */ +class BufferedSocket : protected SocketMonitor { + fifo_buffer *input; + +public: + BufferedSocket(int _fd, EventLoop &_loop) + :SocketMonitor(_fd, _loop), input(nullptr) { + ScheduleRead(); + } + + ~BufferedSocket(); + + using SocketMonitor::IsDefined; + using SocketMonitor::Close; + using SocketMonitor::Write; + +private: + ssize_t DirectRead(void *data, size_t length); + + /** + * Receive data from the socket to the input buffer. + * + * @return false if the socket has been closed + */ + bool ReadToBuffer(); + +protected: + /** + * @return false if the socket has been closed + */ + bool ResumeInput(); + + /** + * Mark a portion of the input buffer "consumed". Only + * allowed to be called from OnSocketInput(). This method + * does not invalidate the pointer passed to OnSocketInput() + * yet. + */ + void ConsumeInput(size_t nbytes); + + enum class InputResult { + /** + * The method was successful, and it is ready to + * read more data. + */ + MORE, + + /** + * The method does not want to get more data for now. + * It will call ResumeInput() when it's ready for + * more. + */ + PAUSE, + + /** + * The method wants to be called again immediately, if + * there's more data in the buffer. + */ + AGAIN, + + /** + * The method has closed the socket. + */ + CLOSED, + }; + + virtual InputResult OnSocketInput(const void *data, size_t length) = 0; + virtual void OnSocketError(GError *error) = 0; + virtual void OnSocketClosed() = 0; + + virtual bool OnSocketReady(unsigned flags) override; +}; + +#endif diff --git a/src/event/FullyBufferedSocket.cxx b/src/event/FullyBufferedSocket.cxx new file mode 100644 index 00000000..a92cb68a --- /dev/null +++ b/src/event/FullyBufferedSocket.cxx @@ -0,0 +1,132 @@ +/* + * 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 "FullyBufferedSocket.hxx" +#include "SocketError.hxx" +#include "util/fifo_buffer.h" + +#include <assert.h> +#include <stdint.h> +#include <string.h> + +#ifndef WIN32 +#include <sys/types.h> +#include <sys/socket.h> +#endif + +FullyBufferedSocket::ssize_t +FullyBufferedSocket::DirectWrite(const void *data, size_t length) +{ + const auto nbytes = SocketMonitor::Write((const char *)data, length); + if (gcc_unlikely(nbytes < 0)) { + const auto code = GetSocketError(); + if (IsSocketErrorAgain(code)) + return 0; + + Cancel(); + + if (IsSocketErrorClosed(code)) + OnSocketClosed(); + else + OnSocketError(NewSocketError(code)); + } + + return nbytes; +} + +bool +FullyBufferedSocket::WriteFromBuffer() +{ + assert(IsDefined()); + + size_t length; + const void *data = output.Read(&length); + if (data == nullptr) { + CancelWrite(); + return true; + } + + auto nbytes = DirectWrite(data, length); + if (gcc_unlikely(nbytes <= 0)) + return nbytes == 0; + + output.Consume(nbytes); + + if (output.IsEmpty()) + CancelWrite(); + + return true; +} + +bool +FullyBufferedSocket::Write(const void *data, size_t length) +{ + assert(IsDefined()); + +#if 0 + /* TODO: disabled because this would add overhead on some callers (the ones that often), but it may be useful */ + + if (output.IsEmpty()) { + /* try to write it directly first */ + const auto nbytes = DirectWrite(data, length); + if (gcc_likely(nbytes > 0)) { + data = (const uint8_t *)data + nbytes; + length -= nbytes; + if (length == 0) + return true; + } else if (nbytes < 0) + return false; + } +#endif + + if (!output.Append(data, length)) { + // TODO + OnSocketError(g_error_new_literal(g_quark_from_static_string("buffered_socket"), + 0, "Output buffer is full")); + return false; + } + + ScheduleWrite(); + return true; +} + +bool +FullyBufferedSocket::OnSocketReady(unsigned flags) +{ + const bool was_empty = output.IsEmpty(); + if (!BufferedSocket::OnSocketReady(flags)) + return false; + + if (was_empty && !output.IsEmpty()) + /* just in case the OnSocketInput() method has added + data to the output buffer: try to send it now + instead of waiting for the next event loop + iteration */ + flags |= WRITE; + + if (flags & WRITE) { + assert(!output.IsEmpty()); + + if (!WriteFromBuffer()) + return false; + } + + return true; +} diff --git a/src/event/FullyBufferedSocket.hxx b/src/event/FullyBufferedSocket.hxx new file mode 100644 index 00000000..c67c2c78 --- /dev/null +++ b/src/event/FullyBufferedSocket.hxx @@ -0,0 +1,63 @@ +/* + * 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_FULLY_BUFFERED_SOCKET_HXX +#define MPD_FULLY_BUFFERED_SOCKET_HXX + +#include "check.h" +#include "BufferedSocket.hxx" +#include "util/PeakBuffer.hxx" +#include "gcc.h" + +/** + * A #BufferedSocket specialization that adds an output buffer. + */ +class FullyBufferedSocket : protected BufferedSocket { + PeakBuffer output; + +public: + FullyBufferedSocket(int _fd, EventLoop &_loop, + size_t normal_size, size_t peak_size=0) + :BufferedSocket(_fd, _loop), + output(normal_size, peak_size) { + } + + using BufferedSocket::IsDefined; + using BufferedSocket::Close; + +private: + ssize_t DirectWrite(const void *data, size_t length); + + /** + * Send data from the output buffer to the socket. + * + * @return false if the socket has been closed + */ + bool WriteFromBuffer(); + +protected: + /** + * @return false if the socket has been closed + */ + bool Write(const void *data, size_t length); + + virtual bool OnSocketReady(unsigned flags) override; +}; + +#endif diff --git a/src/event/Loop.hxx b/src/event/Loop.hxx new file mode 100644 index 00000000..72731ea2 --- /dev/null +++ b/src/event/Loop.hxx @@ -0,0 +1,88 @@ +/* + * 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_LOOP_HXX +#define MPD_EVENT_LOOP_HXX + +#include "check.h" +#include "gcc.h" + +#include <glib.h> + +class EventLoop { + GMainContext *context; + GMainLoop *loop; + +public: + EventLoop() + :context(g_main_context_new()), + loop(g_main_loop_new(context, false)) {} + + struct Default {}; + EventLoop(gcc_unused Default _dummy) + :context(g_main_context_ref(g_main_context_default())), + loop(g_main_loop_new(context, false)) {} + + ~EventLoop() { + g_main_loop_unref(loop); + g_main_context_unref(context); + } + + GMainContext *GetContext() { + return context; + } + + void WakeUp() { + g_main_context_wakeup(context); + } + + void Break() { + g_main_loop_quit(loop); + } + + void Run() { + g_main_loop_run(loop); + } + + guint AddIdle(GSourceFunc function, gpointer data) { + GSource *source = g_idle_source_new(); + g_source_set_callback(source, function, data, NULL); + guint id = g_source_attach(source, GetContext()); + g_source_unref(source); + return id; + } + + GSource *AddTimeout(guint interval_ms, + GSourceFunc function, gpointer data) { + GSource *source = g_timeout_source_new(interval_ms); + g_source_set_callback(source, function, data, nullptr); + g_source_attach(source, GetContext()); + return source; + } + + GSource *AddTimeoutSeconds(guint interval_s, + GSourceFunc function, gpointer data) { + GSource *source = g_timeout_source_new_seconds(interval_s); + g_source_set_callback(source, function, data, nullptr); + g_source_attach(source, GetContext()); + return source; + } +}; + +#endif /* MAIN_NOTIFY_H */ diff --git a/src/event/MultiSocketMonitor.cxx b/src/event/MultiSocketMonitor.cxx new file mode 100644 index 00000000..6f20b907 --- /dev/null +++ b/src/event/MultiSocketMonitor.cxx @@ -0,0 +1,107 @@ +/* + * 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 "MultiSocketMonitor.hxx" +#include "Loop.hxx" +#include "fd_util.h" +#include "gcc.h" + +#include <assert.h> + +/** + * The vtable for our GSource implementation. Unfortunately, we + * cannot declare it "const", because g_source_new() takes a non-const + * pointer, for whatever reason. + */ +static GSourceFuncs multi_socket_monitor_source_funcs = { + MultiSocketMonitor::Prepare, + MultiSocketMonitor::Check, + MultiSocketMonitor::Dispatch, + nullptr, + nullptr, + nullptr, +}; + +MultiSocketMonitor::MultiSocketMonitor(EventLoop &_loop) + :loop(_loop), + source((Source *)g_source_new(&multi_socket_monitor_source_funcs, + sizeof(*source))) { + source->monitor = this; + + g_source_attach(&source->base, loop.GetContext()); +} + +MultiSocketMonitor::~MultiSocketMonitor() +{ + g_source_destroy(&source->base); + g_source_unref(&source->base); + source = nullptr; +} + +bool +MultiSocketMonitor::Check() const +{ + if (CheckSockets()) + return true; + + for (const auto &i : fds) + if (i.revents != 0) + return true; + + return false; +} + +/* + * GSource methods + * + */ + +gboolean +MultiSocketMonitor::Prepare(GSource *_source, gint *timeout_r) +{ + Source &source = *(Source *)_source; + MultiSocketMonitor &monitor = *source.monitor; + assert(_source == &monitor.source->base); + + return monitor.Prepare(timeout_r); +} + +gboolean +MultiSocketMonitor::Check(GSource *_source) +{ + const Source &source = *(const Source *)_source; + const MultiSocketMonitor &monitor = *source.monitor; + assert(_source == &monitor.source->base); + + return monitor.Check(); +} + +gboolean +MultiSocketMonitor::Dispatch(GSource *_source, + gcc_unused GSourceFunc callback, + gcc_unused gpointer user_data) +{ + Source &source = *(Source *)_source; + MultiSocketMonitor &monitor = *source.monitor; + assert(_source == &monitor.source->base); + + monitor.Dispatch(); + return true; +} diff --git a/src/event/MultiSocketMonitor.hxx b/src/event/MultiSocketMonitor.hxx new file mode 100644 index 00000000..bf0a221a --- /dev/null +++ b/src/event/MultiSocketMonitor.hxx @@ -0,0 +1,125 @@ +/* + * 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_MULTI_SOCKET_MONITOR_HXX +#define MPD_MULTI_SOCKET_MONITOR_HXX + +#include "check.h" +#include "gcc.h" +#include "glib_compat.h" + +#include <glib.h> + +#include <forward_list> + +#include <assert.h> + +#ifdef WIN32 +/* ERRORis a WIN32 macro that poisons our namespace; this is a + kludge to allow us to use it anyway */ +#ifdef ERROR +#undef ERROR +#endif +#endif + +class EventLoop; + +/** + * Monitor multiple sockets. + */ +class MultiSocketMonitor { + struct Source { + GSource base; + + MultiSocketMonitor *monitor; + }; + + EventLoop &loop; + Source *source; + std::forward_list<GPollFD> fds; + +public: + static constexpr unsigned READ = G_IO_IN; + static constexpr unsigned WRITE = G_IO_OUT; + static constexpr unsigned ERROR = G_IO_ERR; + static constexpr unsigned HANGUP = G_IO_HUP; + + MultiSocketMonitor(EventLoop &_loop); + ~MultiSocketMonitor(); + +public: + gcc_pure + gint64 GetTime() const { + return g_source_get_time(&source->base); + } + + void InvalidateSockets() { + /* no-op because GLib always calls the GSource's + "prepare" method before each poll() anyway */ + } + + void AddSocket(int fd, unsigned events) { + fds.push_front({fd, gushort(events), 0}); + g_source_add_poll(&source->base, &fds.front()); + } + + template<typename E> + void UpdateSocketList(E &&e) { + for (auto prev = fds.before_begin(), end = fds.end(), + i = std::next(prev); + i != end; i = std::next(prev)) { + assert(i->events != 0); + + unsigned events = e(i->fd); + if (events != 0) { + i->events = events; + prev = i; + } else { + g_source_remove_poll(&source->base, &*i); + fds.erase_after(prev); + } + } + } + +protected: + virtual void PrepareSockets(gcc_unused gint *timeout_r) {} + virtual bool CheckSockets() const { return false; } + virtual void DispatchSockets() = 0; + +public: + /* GSource callbacks */ + static gboolean Prepare(GSource *source, gint *timeout_r); + static gboolean Check(GSource *source); + static gboolean Dispatch(GSource *source, GSourceFunc callback, + gpointer user_data); + +private: + bool Prepare(gint *timeout_r) { + PrepareSockets(timeout_r); + return false; + } + + bool Check() const; + + void Dispatch() { + DispatchSockets(); + } +}; + +#endif diff --git a/src/event/ServerSocket.cxx b/src/event/ServerSocket.cxx new file mode 100644 index 00000000..119bfe1d --- /dev/null +++ b/src/event/ServerSocket.cxx @@ -0,0 +1,438 @@ +/* + * 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 HAVE_STRUCT_UCRED +#define _GNU_SOURCE 1 +#endif + +#include "ServerSocket.hxx" +#include "SocketUtil.hxx" +#include "SocketError.hxx" +#include "event/SocketMonitor.hxx" +#include "resolver.h" +#include "fd_util.h" + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> +#include <stdlib.h> +#include <assert.h> + +#ifdef WIN32 +#include <ws2tcpip.h> +#include <winsock.h> +#else +#include <netinet/in.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <netdb.h> +#endif + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "listen" + +#define DEFAULT_PORT 6600 + +class OneServerSocket final : private SocketMonitor { + ServerSocket &parent; + + const unsigned serial; + + char *path; + + size_t address_length; + struct sockaddr *address; + +public: + OneServerSocket(EventLoop &_loop, ServerSocket &_parent, + unsigned _serial, + const struct sockaddr *_address, + size_t _address_length) + :SocketMonitor(_loop), + parent(_parent), serial(_serial), + path(nullptr), + address_length(_address_length), + address((sockaddr *)g_memdup(_address, _address_length)) + { + assert(_address != nullptr); + assert(_address_length > 0); + } + + OneServerSocket(const OneServerSocket &other) = delete; + OneServerSocket &operator=(const OneServerSocket &other) = delete; + + ~OneServerSocket() { + g_free(path); + g_free(address); + } + + unsigned GetSerial() const { + return serial; + } + + void SetPath(const char *_path) { + assert(path == nullptr); + + path = g_strdup(_path); + } + + bool Open(GError **error_r); + + using SocketMonitor::IsDefined; + using SocketMonitor::Close; + + char *ToString() const; + + void SetFD(int _fd) { + SocketMonitor::Open(_fd); + SocketMonitor::ScheduleRead(); + } + + void Accept(); + +private: + virtual bool OnSocketReady(unsigned flags) override; +}; + +static GQuark +server_socket_quark(void) +{ + return g_quark_from_static_string("server_socket"); +} + +/** + * Wraper for sockaddr_to_string() which never fails. + */ +char * +OneServerSocket::ToString() const +{ + char *p = sockaddr_to_string(address, address_length, nullptr); + if (p == nullptr) + p = g_strdup("[unknown]"); + return p; +} + +static int +get_remote_uid(int fd) +{ +#ifdef HAVE_STRUCT_UCRED + struct ucred cred; + socklen_t len = sizeof (cred); + + if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0) + return 0; + + return cred.uid; +#else +#ifdef HAVE_GETPEEREID + uid_t euid; + gid_t egid; + + if (getpeereid(fd, &euid, &egid) == 0) + return euid; +#else + (void)fd; +#endif + return -1; +#endif +} + +inline void +OneServerSocket::Accept() +{ + struct sockaddr_storage peer_address; + size_t peer_address_length = sizeof(peer_address); + int peer_fd = + accept_cloexec_nonblock(Get(), (struct sockaddr*)&peer_address, + &peer_address_length); + if (peer_fd < 0) { + const SocketErrorMessage msg; + g_warning("accept() failed: %s", (const char *)msg); + return; + } + + if (socket_keepalive(peer_fd)) { + const SocketErrorMessage msg; + g_warning("Could not set TCP keepalive option: %s", + (const char *)msg); + } + + parent.OnAccept(peer_fd, + (const sockaddr &)peer_address, + peer_address_length, get_remote_uid(peer_fd)); +} + +bool +OneServerSocket::OnSocketReady(gcc_unused unsigned flags) +{ + Accept(); + return true; +} + +inline bool +OneServerSocket::Open(GError **error_r) +{ + assert(!IsDefined()); + + int _fd = socket_bind_listen(address->sa_family, + SOCK_STREAM, 0, + address, address_length, 5, + error_r); + if (_fd < 0) + return false; + + /* allow everybody to connect */ + + if (path != nullptr) + chmod(path, 0666); + + /* register in the GLib main loop */ + + SetFD(_fd); + + return true; +} + +ServerSocket::ServerSocket(EventLoop &_loop) + :loop(_loop), next_serial(1) {} + +/* this is just here to allow the OneServerSocket forward + declaration */ +ServerSocket::~ServerSocket() {} + +bool +ServerSocket::Open(GError **error_r) +{ + OneServerSocket *good = nullptr, *bad = nullptr; + GError *last_error = nullptr; + + for (auto &i : sockets) { + assert(i.GetSerial() > 0); + assert(good == nullptr || i.GetSerial() <= good->GetSerial()); + + if (bad != nullptr && i.GetSerial() != bad->GetSerial()) { + Close(); + g_propagate_error(error_r, last_error); + return false; + } + + GError *error = nullptr; + if (!i.Open(&error)) { + if (good != nullptr && good->GetSerial() == i.GetSerial()) { + char *address_string = i.ToString(); + char *good_string = good->ToString(); + g_warning("bind to '%s' failed: %s " + "(continuing anyway, because " + "binding to '%s' succeeded)", + address_string, error->message, + good_string); + g_free(address_string); + g_free(good_string); + g_error_free(error); + } else if (bad == nullptr) { + bad = &i; + + char *address_string = i.ToString(); + g_propagate_prefixed_error(&last_error, error, + "Failed to bind to '%s': ", + address_string); + g_free(address_string); + } else + g_error_free(error); + continue; + } + + /* mark this socket as "good", and clear previous + errors */ + + good = &i; + + if (bad != nullptr) { + bad = nullptr; + g_error_free(last_error); + last_error = nullptr; + } + } + + if (bad != nullptr) { + Close(); + g_propagate_error(error_r, last_error); + return false; + } + + return true; +} + +void +ServerSocket::Close() +{ + for (auto &i : sockets) + if (i.IsDefined()) + i.Close(); +} + +OneServerSocket & +ServerSocket::AddAddress(const sockaddr &address, size_t address_length) +{ + sockets.emplace_front(loop, *this, next_serial, + &address, address_length); + + return sockets.front(); +} + +bool +ServerSocket::AddFD(int fd, GError **error_r) +{ + assert(fd >= 0); + + struct sockaddr_storage address; + socklen_t address_length = sizeof(address); + if (getsockname(fd, (struct sockaddr *)&address, + &address_length) < 0) { + SetSocketError(error_r); + g_prefix_error(error_r, "Failed to get socket address"); + return false; + } + + OneServerSocket &s = AddAddress((const sockaddr &)address, + address_length); + s.SetFD(fd); + + return true; +} + +#ifdef HAVE_TCP + +inline void +ServerSocket::AddPortIPv4(unsigned port) +{ + struct sockaddr_in sin; + memset(&sin, 0, sizeof(sin)); + sin.sin_port = htons(port); + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = INADDR_ANY; + + AddAddress((const sockaddr &)sin, sizeof(sin)); +} + +#ifdef HAVE_IPV6 +inline void +ServerSocket::AddPortIPv6(unsigned port) +{ + struct sockaddr_in6 sin; + memset(&sin, 0, sizeof(sin)); + sin.sin6_port = htons(port); + sin.sin6_family = AF_INET6; + + AddAddress((const sockaddr &)sin, sizeof(sin)); +} +#endif /* HAVE_IPV6 */ + +#endif /* HAVE_TCP */ + +bool +ServerSocket::AddPort(unsigned port, GError **error_r) +{ +#ifdef HAVE_TCP + if (port == 0 || port > 0xffff) { + g_set_error(error_r, server_socket_quark(), 0, + "Invalid TCP port"); + return false; + } + +#ifdef HAVE_IPV6 + AddPortIPv6(port); +#endif + AddPortIPv4(port); + + ++next_serial; + + return true; +#else /* HAVE_TCP */ + (void)port; + + g_set_error(error_r, server_socket_quark(), 0, + "TCP support is disabled"); + return false; +#endif /* HAVE_TCP */ +} + +bool +ServerSocket::AddHost(const char *hostname, unsigned port, GError **error_r) +{ +#ifdef HAVE_TCP + struct addrinfo *ai = resolve_host_port(hostname, port, + AI_PASSIVE, SOCK_STREAM, + error_r); + if (ai == nullptr) + return false; + + for (const struct addrinfo *i = ai; i != nullptr; i = i->ai_next) + AddAddress(*i->ai_addr, i->ai_addrlen); + + freeaddrinfo(ai); + + ++next_serial; + + return true; +#else /* HAVE_TCP */ + (void)hostname; + (void)port; + + g_set_error(error_r, server_socket_quark(), 0, + "TCP support is disabled"); + return false; +#endif /* HAVE_TCP */ +} + +bool +ServerSocket::AddPath(const char *path, GError **error_r) +{ +#ifdef HAVE_UN + struct sockaddr_un s_un; + + size_t path_length = strlen(path); + if (path_length >= sizeof(s_un.sun_path)) { + g_set_error(error_r, server_socket_quark(), 0, + "UNIX socket path is too long"); + return false; + } + + unlink(path); + + s_un.sun_family = AF_UNIX; + memcpy(s_un.sun_path, path, path_length + 1); + + OneServerSocket &s = AddAddress((const sockaddr &)s_un, sizeof(s_un)); + s.SetPath(path); + + return true; +#else /* !HAVE_UN */ + (void)path; + + g_set_error(error_r, server_socket_quark(), 0, + "UNIX domain socket support is disabled"); + return false; +#endif /* !HAVE_UN */ +} + diff --git a/src/event/ServerSocket.hxx b/src/event/ServerSocket.hxx new file mode 100644 index 00000000..600cdf8a --- /dev/null +++ b/src/event/ServerSocket.hxx @@ -0,0 +1,121 @@ +/* + * 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_SERVER_SOCKET_HXX +#define MPD_SERVER_SOCKET_HXX + +#include "gerror.h" + +#include <forward_list> + +#include <stddef.h> + +struct sockaddr; +class EventLoop; + +typedef void (*server_socket_callback_t)(int fd, + const struct sockaddr *address, + size_t address_length, int uid, + void *ctx); + +class OneServerSocket; + +class ServerSocket { + friend class OneServerSocket; + + EventLoop &loop; + + std::forward_list<OneServerSocket> sockets; + + unsigned next_serial; + +public: + ServerSocket(EventLoop &_loop); + ~ServerSocket(); + + EventLoop &GetEventLoop() { + return loop; + } + +private: + OneServerSocket &AddAddress(const sockaddr &address, size_t length); + + /** + * Add a listener on a port on all IPv4 interfaces. + * + * @param port the TCP port + */ + void AddPortIPv4(unsigned port); + + /** + * Add a listener on a port on all IPv6 interfaces. + * + * @param port the TCP port + */ + void AddPortIPv6(unsigned port); + +public: + /** + * Add a listener on a port on all interfaces. + * + * @param port the TCP port + * @param error_r location to store the error occurring, or NULL to + * ignore errors + * @return true on success + */ + bool AddPort(unsigned port, GError **error_r); + + /** + * Resolves a host name, and adds listeners on all addresses in the + * result set. + * + * @param hostname the host name to be resolved + * @param port the TCP port + * @param error_r location to store the error occurring, or NULL to + * ignore errors + * @return true on success + */ + bool AddHost(const char *hostname, unsigned port, GError **error_r); + + /** + * Add a listener on a Unix domain socket. + * + * @param path the absolute socket path + * @param error_r location to store the error occurring, or NULL to + * ignore errors + * @return true on success + */ + bool AddPath(const char *path, GError **error_r); + + /** + * Add a socket descriptor that is accepting connections. After this + * has been called, don't call server_socket_open(), because the + * socket is already open. + */ + bool AddFD(int fd, GError **error_r); + + bool Open(GError **error_r); + void Close(); + +protected: + virtual void OnAccept(int fd, const sockaddr &address, + size_t address_length, int uid) = 0; +}; + +#endif diff --git a/src/event/SocketMonitor.cxx b/src/event/SocketMonitor.cxx new file mode 100644 index 00000000..6efa6964 --- /dev/null +++ b/src/event/SocketMonitor.cxx @@ -0,0 +1,167 @@ +/* + * 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 "SocketMonitor.hxx" +#include "Loop.hxx" +#include "fd_util.h" +#include "gcc.h" + +#include <assert.h> + +#ifdef WIN32 +#include <winsock2.h> +#else +#include <sys/types.h> +#include <sys/socket.h> +#endif + +/* + * GSource methods + * + */ + +gboolean +SocketMonitor::Prepare(gcc_unused GSource *source, gcc_unused gint *timeout_r) +{ + return false; +} + +gboolean +SocketMonitor::Check(GSource *_source) +{ + const Source &source = *(const Source *)_source; + const SocketMonitor &monitor = *source.monitor; + assert(_source == &monitor.source->base); + + return monitor.Check(); +} + +gboolean +SocketMonitor::Dispatch(GSource *_source, + gcc_unused GSourceFunc callback, + gcc_unused gpointer user_data) +{ + Source &source = *(Source *)_source; + SocketMonitor &monitor = *source.monitor; + assert(_source == &monitor.source->base); + + monitor.Dispatch(); + return true; +} + +/** + * The vtable for our GSource implementation. Unfortunately, we + * cannot declare it "const", because g_source_new() takes a non-const + * pointer, for whatever reason. + */ +static GSourceFuncs socket_monitor_source_funcs = { + SocketMonitor::Prepare, + SocketMonitor::Check, + SocketMonitor::Dispatch, + nullptr, + nullptr, + nullptr, +}; + +SocketMonitor::SocketMonitor(int _fd, EventLoop &_loop) + :fd(-1), loop(_loop), + source(nullptr) { + assert(_fd >= 0); + + Open(_fd); +} + +SocketMonitor::~SocketMonitor() +{ + if (IsDefined()) + Close(); +} + +void +SocketMonitor::Open(int _fd) +{ + assert(fd < 0); + assert(source == nullptr); + assert(_fd >= 0); + + fd = _fd; + poll = {fd, 0, 0}; + + source = (Source *)g_source_new(&socket_monitor_source_funcs, + sizeof(*source)); + source->monitor = this; + + g_source_attach(&source->base, loop.GetContext()); + g_source_add_poll(&source->base, &poll); +} + +int +SocketMonitor::Steal() +{ + assert(IsDefined()); + + Cancel(); + + int result = fd; + fd = -1; + + g_source_destroy(&source->base); + g_source_unref(&source->base); + source = nullptr; + + return result; +} + +void +SocketMonitor::Close() +{ + close_socket(Steal()); +} + +SocketMonitor::ssize_t +SocketMonitor::Read(void *data, size_t length) +{ + int flags = 0; +#ifdef MSG_DONTWAIT + flags |= MSG_DONTWAIT; +#endif + + return recv(Get(), (char *)data, length, flags); +} + +SocketMonitor::ssize_t +SocketMonitor::Write(const void *data, size_t length) +{ + int flags = 0; +#ifdef MSG_NOSIGNAL + flags |= MSG_NOSIGNAL; +#endif +#ifdef MSG_DONTWAIT + flags |= MSG_DONTWAIT; +#endif + + return send(Get(), (const char *)data, length, flags); +} + +void +SocketMonitor::CommitEventFlags() +{ + loop.WakeUp(); +} diff --git a/src/event/SocketMonitor.hxx b/src/event/SocketMonitor.hxx new file mode 100644 index 00000000..c60b8efd --- /dev/null +++ b/src/event/SocketMonitor.hxx @@ -0,0 +1,148 @@ +/* + * 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_SOCKET_MONITOR_HXX +#define MPD_SOCKET_MONITOR_HXX + +#include "check.h" + +#include <glib.h> + +#include <type_traits> + +#include <assert.h> +#include <stddef.h> + +#ifdef WIN32 +/* ERRORis a WIN32 macro that poisons our namespace; this is a + kludge to allow us to use it anyway */ +#ifdef ERROR +#undef ERROR +#endif +#endif + +class EventLoop; + +class SocketMonitor { + struct Source { + GSource base; + + SocketMonitor *monitor; + }; + + int fd; + EventLoop &loop; + Source *source; + GPollFD poll; + +public: + static constexpr unsigned READ = G_IO_IN; + static constexpr unsigned WRITE = G_IO_OUT; + static constexpr unsigned ERROR = G_IO_ERR; + static constexpr unsigned HANGUP = G_IO_HUP; + + typedef std::make_signed<size_t>::type ssize_t; + + SocketMonitor(EventLoop &_loop) + :fd(-1), loop(_loop), source(nullptr) {} + + SocketMonitor(int _fd, EventLoop &_loop); + + ~SocketMonitor(); + + bool IsDefined() const { + return fd >= 0; + } + + int Get() const { + assert(IsDefined()); + + return fd; + } + + void Open(int _fd); + + /** + * "Steal" the socket descriptor. This abandons the socket + * and puts the responsibility for closing it to the caller. + */ + int Steal(); + + void Close(); + + void Schedule(unsigned flags) { + poll.events = flags; + poll.revents &= flags; + CommitEventFlags(); + } + + void Cancel() { + poll.events = 0; + CommitEventFlags(); + } + + void ScheduleRead() { + poll.events |= READ|HANGUP|ERROR; + CommitEventFlags(); + } + + void ScheduleWrite() { + poll.events |= WRITE; + CommitEventFlags(); + } + + void CancelRead() { + poll.events &= ~(READ|HANGUP|ERROR); + CommitEventFlags(); + } + + void CancelWrite() { + poll.events &= ~WRITE; + CommitEventFlags(); + } + + ssize_t Read(void *data, size_t length); + ssize_t Write(const void *data, size_t length); + +protected: + /** + * @return false if the socket has been closed + */ + virtual bool OnSocketReady(unsigned flags) = 0; + +public: + /* GSource callbacks */ + static gboolean Prepare(GSource *source, gint *timeout_r); + static gboolean Check(GSource *source); + static gboolean Dispatch(GSource *source, GSourceFunc callback, + gpointer user_data); + +private: + void CommitEventFlags(); + + bool Check() const { + return (poll.revents & poll.events) != 0; + } + + void Dispatch() { + OnSocketReady(poll.revents & poll.events); + } +}; + +#endif diff --git a/src/event/TimeoutMonitor.cxx b/src/event/TimeoutMonitor.cxx new file mode 100644 index 00000000..e0bf997a --- /dev/null +++ b/src/event/TimeoutMonitor.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" +#include "TimeoutMonitor.hxx" +#include "Loop.hxx" + +void +TimeoutMonitor::Cancel() +{ + if (source != nullptr) { + g_source_destroy(source); + g_source_unref(source); + source = nullptr; + } +} + +void +TimeoutMonitor::Schedule(unsigned ms) +{ + Cancel(); + source = loop.AddTimeout(ms, Callback, this); +} + +void +TimeoutMonitor::ScheduleSeconds(unsigned s) +{ + Cancel(); + source = loop.AddTimeoutSeconds(s, Callback, this); +} + +bool +TimeoutMonitor::Run() +{ + bool result = OnTimeout(); + if (!result && source != nullptr) { + g_source_unref(source); + source = nullptr; + } + + return result; +} + +gboolean +TimeoutMonitor::Callback(gpointer data) +{ + TimeoutMonitor &monitor = *(TimeoutMonitor *)data; + return monitor.Run(); +} diff --git a/src/event/TimeoutMonitor.hxx b/src/event/TimeoutMonitor.hxx new file mode 100644 index 00000000..6914bcb6 --- /dev/null +++ b/src/event/TimeoutMonitor.hxx @@ -0,0 +1,60 @@ +/* + * 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_SOCKET_TIMEOUT_MONITOR_HXX +#define MPD_SOCKET_TIMEOUT_MONITOR_HXX + +#include "check.h" + +#include <glib.h> + +class EventLoop; + +class TimeoutMonitor { + EventLoop &loop; + GSource *source; + +public: + TimeoutMonitor(EventLoop &_loop) + :loop(_loop), source(nullptr) {} + + ~TimeoutMonitor() { + Cancel(); + } + + bool IsActive() const { + return source != nullptr; + } + + void Schedule(unsigned ms); + void ScheduleSeconds(unsigned s); + void Cancel(); + +protected: + /** + * @return true reschedules the timeout again + */ + virtual bool OnTimeout() = 0; + +private: + bool Run(); + static gboolean Callback(gpointer data); +}; + +#endif /* MAIN_NOTIFY_H */ diff --git a/src/event/WakeFD.cxx b/src/event/WakeFD.cxx new file mode 100644 index 00000000..1a84f564 --- /dev/null +++ b/src/event/WakeFD.cxx @@ -0,0 +1,225 @@ +/* + * 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 diff --git a/src/event/WakeFD.hxx b/src/event/WakeFD.hxx new file mode 100644 index 00000000..15b66b4c --- /dev/null +++ b/src/event/WakeFD.hxx @@ -0,0 +1,80 @@ +/* + * 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_WAKE_FD_HXX +#define MPD_WAKE_FD_HXX + +#include "check.h" + +#include <assert.h> + +/** + * This class can be used to wake up an I/O event loop. + * + * For optimization purposes, this class does not have a constructor + * or a destructor. + */ +class WakeFD { + int fds[2]; + +public: +#ifdef NDEBUG + WakeFD() = default; +#else + WakeFD():fds{-1, -1} {}; +#endif + + WakeFD(const WakeFD &other) = delete; + WakeFD &operator=(const WakeFD &other) = delete; + + bool Create(); + void Destroy(); + + int Get() const { + assert(fds[0] >= 0); +#ifndef HAVE_EVENTFD + assert(fds[1] >= 0); +#endif + + 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(); + +private: +#ifdef HAVE_EVENTFD + bool IsEventFD() { + assert(fds[0] >= 0); + + return fds[1] == -2; + } +#endif +}; + +#endif /* MAIN_NOTIFY_H */ |