event/SignalMonitor: use signalfd() if available

1 files changed, 58 insertions, 0 deletions

diff --git a/src/system/SignalFD.cxx b/src/system/SignalFD.cxx
new file mode 100644
index 000000000..b89775dcd
--- /dev/null
+++ b/src/system/SignalFD.cxx
@@ -0,0 +1,58 @@
+/*
+ * 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_SIGNALFD
+#include "SignalFD.hxx"
+#include "fd_util.h"
+#include "FatalError.hxx"
+
+#include <assert.h>
+#include <unistd.h>
+#include <sys/signalfd.h>
+
+void
+SignalFD::Create(const sigset_t &mask)
+{
+	fd = ::signalfd(fd, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+	if (fd < 0)
+		FatalSystemError("signalfd() failed");
+}
+
+void
+SignalFD::Close()
+{
+	if (fd >= 0) {
+		::close(fd);
+		fd = -1;
+	}
+}
+
+int
+SignalFD::Read()
+{
+	assert(fd >= 0);
+
+	signalfd_siginfo info;
+	return read(fd, &info, sizeof(info)) > 0
+		? info.ssi_signo
+		: -1;
+}
+
+#endif /* USE_SIGNALFD */