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-rw-r--r--src/GlobalEvents.hxx5
-rw-r--r--src/Main.cxx9
-rw-r--r--src/SignalHandlers.cxx32
-rw-r--r--src/SignalHandlers.hxx8
-rw-r--r--src/event/SignalMonitor.cxx133
-rw-r--r--src/event/SignalMonitor.hxx64
6 files changed, 233 insertions, 18 deletions
diff --git a/src/GlobalEvents.hxx b/src/GlobalEvents.hxx
index fac116935..16de7e675 100644
--- a/src/GlobalEvents.hxx
+++ b/src/GlobalEvents.hxx
@@ -46,14 +46,13 @@ namespace GlobalEvents {
/** the current song's tag has changed */
TAG,
- /** SIGHUP received: reload configuration, roll log file */
- RELOAD,
-
/** a hardware mixer plugin has detected a change */
MIXER,
+#ifdef WIN32
/** shutdown requested */
SHUTDOWN,
+#endif
MAX
};
diff --git a/src/Main.cxx b/src/Main.cxx
index cbf501267..a1a3fe976 100644
--- a/src/Main.cxx
+++ b/src/Main.cxx
@@ -351,6 +351,8 @@ idle_event_emitted(void)
state_file->CheckModified();
}
+#ifdef WIN32
+
/**
* Handler for GlobalEvents::SHUTDOWN.
*/
@@ -360,6 +362,8 @@ shutdown_event_emitted(void)
main_loop->Break();
}
+#endif
+
int main(int argc, char *argv[])
{
#ifdef WIN32
@@ -436,7 +440,9 @@ int mpd_main(int argc, char *argv[])
GlobalEvents::Initialize();
GlobalEvents::Register(GlobalEvents::IDLE, idle_event_emitted);
+#ifdef WIN32
GlobalEvents::Register(GlobalEvents::SHUTDOWN, shutdown_event_emitted);
+#endif
Path::GlobalInit();
@@ -486,7 +492,7 @@ int mpd_main(int argc, char *argv[])
setup_log_output(options.log_stderr);
- initSigHandlers();
+ SignalHandlersInit(*main_loop);
if (!io_thread_start(&error)) {
g_warning("%s", error->message);
@@ -583,6 +589,7 @@ int mpd_main(int argc, char *argv[])
config_global_finish();
stats_global_finish();
io_thread_deinit();
+ SignalHandlersFinish();
delete instance;
delete main_loop;
daemonize_finish();
diff --git a/src/SignalHandlers.cxx b/src/SignalHandlers.cxx
index ef6be448b..9d43dbee1 100644
--- a/src/SignalHandlers.cxx
+++ b/src/SignalHandlers.cxx
@@ -19,6 +19,7 @@
#include "config.h"
#include "SignalHandlers.hxx"
+#include "event/SignalMonitor.hxx"
#ifndef WIN32
@@ -32,14 +33,12 @@
#include <signal.h>
-static void exit_signal_handler(gcc_unused int signum)
-{
- GlobalEvents::Emit(GlobalEvents::SHUTDOWN);
-}
+static EventLoop *shutdown_loop;
-static void reload_signal_handler(gcc_unused int signum)
+static void
+HandleShutdownSignal()
{
- GlobalEvents::Emit(GlobalEvents::RELOAD);
+ shutdown_loop->Break();
}
static void
@@ -58,8 +57,11 @@ handle_reload_event(void)
#endif
-void initSigHandlers(void)
+void
+SignalHandlersInit(EventLoop &loop)
{
+ SignalMonitorInit(loop);
+
#ifndef WIN32
struct sigaction sa;
@@ -68,12 +70,16 @@ void initSigHandlers(void)
sa.sa_handler = SIG_IGN;
x_sigaction(SIGPIPE, &sa);
- sa.sa_handler = exit_signal_handler;
- x_sigaction(SIGINT, &sa);
- x_sigaction(SIGTERM, &sa);
+ shutdown_loop = &loop;
+ SignalMonitorRegister(SIGINT, HandleShutdownSignal);
+ SignalMonitorRegister(SIGTERM, HandleShutdownSignal);
- GlobalEvents::Register(GlobalEvents::RELOAD, handle_reload_event);
- sa.sa_handler = reload_signal_handler;
- x_sigaction(SIGHUP, &sa);
+ SignalMonitorRegister(SIGHUP, handle_reload_event);
#endif
}
+
+void
+SignalHandlersFinish()
+{
+ SignalMonitorFinish();
+}
diff --git a/src/SignalHandlers.hxx b/src/SignalHandlers.hxx
index 99f347fb0..90dab6dec 100644
--- a/src/SignalHandlers.hxx
+++ b/src/SignalHandlers.hxx
@@ -20,6 +20,12 @@
#ifndef MPD_SIGNAL_HANDLERS_HXX
#define MPD_SIGNAL_HANDLERS_HXX
-void initSigHandlers(void);
+class EventLoop;
+
+void
+SignalHandlersInit(EventLoop &loop);
+
+void
+SignalHandlersFinish();
#endif
diff --git a/src/event/SignalMonitor.cxx b/src/event/SignalMonitor.cxx
new file mode 100644
index 000000000..172b47f55
--- /dev/null
+++ b/src/event/SignalMonitor.cxx
@@ -0,0 +1,133 @@
+/*
+ * 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 "SignalMonitor.hxx"
+
+#ifndef WIN32
+
+#include "WakeFD.hxx"
+#include "SocketMonitor.hxx"
+#include "util/Manual.hxx"
+#include "system/FatalError.hxx"
+
+#include <atomic>
+#include <algorithm>
+
+class SignalMonitor final : private SocketMonitor {
+ WakeFD fd;
+
+public:
+ SignalMonitor(EventLoop &_loop)
+ :SocketMonitor(_loop) {
+ SocketMonitor::Open(fd.Get());
+ SocketMonitor::ScheduleRead();
+ }
+
+ ~SignalMonitor() {
+ /* prevent the descriptor to be closed twice */
+ SocketMonitor::Steal();
+ }
+
+ void WakeUp() {
+ fd.Write();
+ }
+
+private:
+ virtual bool OnSocketReady(unsigned flags) override;
+};
+
+/* this should be enough - is it? */
+static constexpr unsigned MAX_SIGNAL = 64;
+
+static SignalHandler signal_handlers[MAX_SIGNAL];
+static std::atomic_bool signal_pending[MAX_SIGNAL];
+
+static Manual<SignalMonitor> monitor;
+
+static void
+SignalCallback(int signo)
+{
+ assert(signal_handlers[signo] != nullptr);
+
+ if (!signal_pending[signo].exchange(true))
+ monitor->WakeUp();
+}
+
+void
+SignalMonitorInit(EventLoop &loop)
+{
+ monitor.Construct(loop);
+}
+
+static void
+x_sigaction(int signum, const struct sigaction &act)
+{
+ if (sigaction(signum, &act, nullptr) < 0)
+ FatalSystemError("sigaction() failed");
+}
+
+void
+SignalMonitorFinish()
+{
+ struct sigaction sa;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_handler = SIG_DFL;
+
+ for (unsigned i = 0; i < MAX_SIGNAL; ++i) {
+ if (signal_handlers[i] != nullptr) {
+ x_sigaction(i, sa);
+ signal_handlers[i] = nullptr;
+ }
+ }
+
+ std::fill_n(signal_pending, MAX_SIGNAL, false);
+
+ monitor.Destruct();
+}
+
+void
+SignalMonitorRegister(int signo, SignalHandler handler)
+{
+ assert(signal_handlers[signo] == nullptr);
+ assert(!signal_pending[signo]);
+
+ signal_handlers[signo] = handler;
+
+ struct sigaction sa;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_handler = SignalCallback;
+ x_sigaction(signo, sa);
+}
+
+bool
+SignalMonitor::OnSocketReady(unsigned)
+{
+ fd.Read();
+
+ for (unsigned i = 0; i < MAX_SIGNAL; ++i)
+ if (signal_pending[i].exchange(false))
+ signal_handlers[i]();
+
+ return true;
+}
+
+#endif
diff --git a/src/event/SignalMonitor.hxx b/src/event/SignalMonitor.hxx
new file mode 100644
index 000000000..94ab0aa30
--- /dev/null
+++ b/src/event/SignalMonitor.hxx
@@ -0,0 +1,64 @@
+/*
+ * 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_SIGNAL_MONITOR_HXX
+#define MPD_SOCKET_SIGNAL_MONITOR_HXX
+
+#include "check.h"
+
+class EventLoop;
+
+#ifndef WIN32
+
+typedef void (*SignalHandler)();
+
+/**
+ * Initialise the signal monitor subsystem.
+ */
+void
+SignalMonitorInit(EventLoop &loop);
+
+/**
+ * Deinitialise the signal monitor subsystem.
+ */
+void
+SignalMonitorFinish();
+
+/**
+ * Register a handler for the specified signal. The handler will be
+ * invoked in a safe context.
+ */
+void
+SignalMonitorRegister(int signo, SignalHandler handler);
+
+#else
+
+static inline void
+SignalMonitorInit(EventLoop &)
+{
+}
+
+static inline void
+SignalMonitorFinish()
+{
+}
+
+#endif
+
+#endif /* MAIN_NOTIFY_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 05:43:47 +0000